[go: nahoru, domu]

CC Animation: Expose TargetProperty enum to be aliased in Blink Platform.

TargetProperty is intended to be used as an alias in Source/platform/animation/CompositorTargetProperty.h

This is slightly better then untyped approach used here:
https://codereview.chromium.org/1599673002
where we setup struct with constants in it and pass uint32_t everywhere.

An alternative approach with strongly typed enum
considered too verbose:
https://codereview.chromium.org/1698813002/

BUG=577016
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1700653002

Cr-Commit-Position: refs/heads/master@{#377501}
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 5d0bd0d..ce1a7c5 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -34,6 +34,8 @@
     "animation/layer_animation_value_provider.h",
     "animation/scroll_offset_animation_curve.cc",
     "animation/scroll_offset_animation_curve.h",
+    "animation/target_property.cc",
+    "animation/target_property.h",
     "animation/timing_function.cc",
     "animation/timing_function.h",
     "animation/transform_operation.cc",
diff --git a/cc/animation/animation.cc b/cc/animation/animation.cc
index dfdaeb70..5c6fcd0f 100644
--- a/cc/animation/animation.cc
+++ b/cc/animation/animation.cc
@@ -27,27 +27,14 @@
               "RunStateEnumSize should equal the number of elements in "
               "s_runStateNames");
 
-// This should match the TargetProperty enum.
-static const char* const s_targetPropertyNames[] = {"TRANSFORM",
-                                                    "OPACITY",
-                                                    "FILTER",
-                                                    "SCROLL_OFFSET",
-                                                    "BACKGROUND_COLOR"};
-
-static_assert(static_cast<int>(cc::Animation::LAST_TARGET_PROPERTY) + 1 ==
-                  arraysize(s_targetPropertyNames),
-              "TargetPropertyEnumSize should equal the number of elements in "
-              "s_targetPropertyNames");
-
 }  // namespace
 
 namespace cc {
 
-scoped_ptr<Animation> Animation::Create(
-    scoped_ptr<AnimationCurve> curve,
-    int animation_id,
-    int group_id,
-    TargetProperty target_property) {
+scoped_ptr<Animation> Animation::Create(scoped_ptr<AnimationCurve> curve,
+                                        int animation_id,
+                                        int group_id,
+                                        TargetProperty::Type target_property) {
   return make_scoped_ptr(
       new Animation(std::move(curve), animation_id, group_id, target_property));
 }
@@ -55,7 +42,7 @@
 Animation::Animation(scoped_ptr<AnimationCurve> curve,
                      int animation_id,
                      int group_id,
-                     TargetProperty target_property)
+                     TargetProperty::Type target_property)
     : curve_(std::move(curve)),
       id_(animation_id),
       group_(group_id),
@@ -85,11 +72,8 @@
     return;
 
   char name_buffer[256];
-  base::snprintf(name_buffer,
-                 sizeof(name_buffer),
-                 "%s-%d",
-                 s_targetPropertyNames[target_property_],
-                 group_);
+  base::snprintf(name_buffer, sizeof(name_buffer), "%s-%d",
+                 TargetProperty::GetName(target_property_), group_);
 
   bool is_waiting_to_start =
       run_state_ == WAITING_FOR_TARGET_AVAILABILITY || run_state_ == STARTING;
diff --git a/cc/animation/animation.h b/cc/animation/animation.h
index fb8f8d82..645b71f 100644
--- a/cc/animation/animation.h
+++ b/cc/animation/animation.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
+#include "cc/animation/target_property.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
@@ -39,16 +40,6 @@
     LAST_RUN_STATE = ABORTED
   };
 
-  enum TargetProperty {
-    TRANSFORM = 0,
-    OPACITY,
-    FILTER,
-    SCROLL_OFFSET,
-    BACKGROUND_COLOR,
-    // This sentinel must be last.
-    LAST_TARGET_PROPERTY = BACKGROUND_COLOR
-  };
-
   enum Direction {
     DIRECTION_NORMAL,
     DIRECTION_REVERSE,
@@ -66,13 +57,13 @@
   static scoped_ptr<Animation> Create(scoped_ptr<AnimationCurve> curve,
                                       int animation_id,
                                       int group_id,
-                                      TargetProperty target_property);
+                                      TargetProperty::Type target_property);
 
   virtual ~Animation();
 
   int id() const { return id_; }
   int group() const { return group_; }
-  TargetProperty target_property() const { return target_property_; }
+  TargetProperty::Type target_property() const { return target_property_; }
 
   RunState run_state() const { return run_state_; }
   void SetRunState(RunState run_state, base::TimeTicks monotonic_time);
@@ -175,7 +166,7 @@
   Animation(scoped_ptr<AnimationCurve> curve,
             int animation_id,
             int group_id,
-            TargetProperty target_property);
+            TargetProperty::Type target_property);
 
   base::TimeDelta ConvertToActiveTime(base::TimeTicks monotonic_time) const;
 
@@ -190,7 +181,7 @@
   // all animations in the group have finished animating.
   int group_;
 
-  TargetProperty target_property_;
+  TargetProperty::Type target_property_;
   RunState run_state_;
   double iterations_;
   double iteration_start_;
diff --git a/cc/animation/animation_delegate.h b/cc/animation/animation_delegate.h
index 6064c7e..732e693 100644
--- a/cc/animation/animation_delegate.h
+++ b/cc/animation/animation_delegate.h
@@ -13,15 +13,14 @@
 class CC_EXPORT AnimationDelegate {
  public:
   virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                                      Animation::TargetProperty target_property,
+                                      TargetProperty::Type target_property,
                                       int group) = 0;
-  virtual void NotifyAnimationFinished(
-      base::TimeTicks monotonic_time,
-      Animation::TargetProperty target_property,
-      int group) = 0;
+  virtual void NotifyAnimationFinished(base::TimeTicks monotonic_time,
+                                       TargetProperty::Type target_property,
+                                       int group) = 0;
 
   virtual void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                                      Animation::TargetProperty target_property,
+                                      TargetProperty::Type target_property,
                                       int group) = 0;
 
  protected:
diff --git a/cc/animation/animation_events.cc b/cc/animation/animation_events.cc
index bdf6592..edd435b7 100644
--- a/cc/animation/animation_events.cc
+++ b/cc/animation/animation_events.cc
@@ -9,7 +9,7 @@
 AnimationEvent::AnimationEvent(AnimationEvent::Type type,
                                int layer_id,
                                int group_id,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                base::TimeTicks monotonic_time)
     : type(type),
       layer_id(layer_id),
@@ -17,8 +17,7 @@
       target_property(target_property),
       monotonic_time(monotonic_time),
       is_impl_only(false),
-      opacity(0.f) {
-}
+      opacity(0.f) {}
 
 AnimationEvent::AnimationEvent(const AnimationEvent& other) = default;
 
diff --git a/cc/animation/animation_events.h b/cc/animation/animation_events.h
index b65a678b..650b9b5 100644
--- a/cc/animation/animation_events.h
+++ b/cc/animation/animation_events.h
@@ -20,14 +20,14 @@
   AnimationEvent(Type type,
                  int layer_id,
                  int group_id,
-                 Animation::TargetProperty target_property,
+                 TargetProperty::Type target_property,
                  base::TimeTicks monotonic_time);
   AnimationEvent(const AnimationEvent& other);
 
   Type type;
   int layer_id;
   int group_id;
-  Animation::TargetProperty target_property;
+  TargetProperty::Type target_property;
   base::TimeTicks monotonic_time;
   bool is_impl_only;
   float opacity;
diff --git a/cc/animation/animation_host.cc b/cc/animation/animation_host.cc
index cf34e38..2165fe0c 100644
--- a/cc/animation/animation_host.cc
+++ b/cc/animation/animation_host.cc
@@ -54,7 +54,7 @@
 
     scoped_ptr<Animation> animation = Animation::Create(
         std::move(curve), AnimationIdProvider::NextAnimationId(),
-        AnimationIdProvider::NextGroupId(), Animation::SCROLL_OFFSET);
+        AnimationIdProvider::NextGroupId(), TargetProperty::SCROLL_OFFSET);
     animation->set_is_impl_only(true);
 
     DCHECK(scroll_offset_animation_player_);
@@ -77,7 +77,7 @@
 
     Animation* animation = scroll_offset_animation_player_->element_animations()
                                ->layer_animation_controller()
-                               ->GetAnimation(Animation::SCROLL_OFFSET);
+                               ->GetAnimation(TargetProperty::SCROLL_OFFSET);
     if (!animation) {
       scroll_offset_animation_player_->DetachLayer();
       return false;
@@ -100,22 +100,23 @@
 
   void ScrollAnimationAbort() {
     DCHECK(scroll_offset_animation_player_);
-    scroll_offset_animation_player_->AbortAnimations(Animation::SCROLL_OFFSET);
+    scroll_offset_animation_player_->AbortAnimations(
+        TargetProperty::SCROLL_OFFSET);
   }
 
   // AnimationDelegate implementation.
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {}
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
-    DCHECK_EQ(target_property, Animation::SCROLL_OFFSET);
+    DCHECK_EQ(target_property, TargetProperty::SCROLL_OFFSET);
     DCHECK(animation_host_->mutator_host_client());
     animation_host_->mutator_host_client()->ScrollOffsetAnimationFinished();
   }
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {}
 
  private:
@@ -392,7 +393,7 @@
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   return controller
              ? controller->IsCurrentlyAnimatingProperty(
-                   Animation::FILTER, ObserverTypeFromTreeType(tree_type))
+                   TargetProperty::FILTER, ObserverTypeFromTreeType(tree_type))
              : false;
 }
 
@@ -401,7 +402,7 @@
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   return controller
              ? controller->IsCurrentlyAnimatingProperty(
-                   Animation::OPACITY, ObserverTypeFromTreeType(tree_type))
+                   TargetProperty::OPACITY, ObserverTypeFromTreeType(tree_type))
              : false;
 }
 
@@ -411,7 +412,8 @@
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   return controller
              ? controller->IsCurrentlyAnimatingProperty(
-                   Animation::TRANSFORM, ObserverTypeFromTreeType(tree_type))
+                   TargetProperty::TRANSFORM,
+                   ObserverTypeFromTreeType(tree_type))
              : false;
 }
 
@@ -421,7 +423,7 @@
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   return controller
              ? controller->IsPotentiallyAnimatingProperty(
-                   Animation::FILTER, ObserverTypeFromTreeType(tree_type))
+                   TargetProperty::FILTER, ObserverTypeFromTreeType(tree_type))
              : false;
 }
 
@@ -431,7 +433,7 @@
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   return controller
              ? controller->IsPotentiallyAnimatingProperty(
-                   Animation::OPACITY, ObserverTypeFromTreeType(tree_type))
+                   TargetProperty::OPACITY, ObserverTypeFromTreeType(tree_type))
              : false;
 }
 
@@ -441,13 +443,14 @@
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   return controller
              ? controller->IsPotentiallyAnimatingProperty(
-                   Animation::TRANSFORM, ObserverTypeFromTreeType(tree_type))
+                   TargetProperty::TRANSFORM,
+                   ObserverTypeFromTreeType(tree_type))
              : false;
 }
 
 bool AnimationHost::HasAnyAnimationTargetingProperty(
     int layer_id,
-    Animation::TargetProperty property) const {
+    TargetProperty::Type property) const {
   LayerAnimationController* controller = GetControllerForLayerId(layer_id);
   if (!controller)
     return false;
@@ -460,7 +463,7 @@
   if (!controller)
     return false;
 
-  Animation* animation = controller->GetAnimation(Animation::FILTER);
+  Animation* animation = controller->GetAnimation(TargetProperty::FILTER);
   return animation && animation->is_impl_only();
 }
 
@@ -469,7 +472,7 @@
   if (!controller)
     return false;
 
-  Animation* animation = controller->GetAnimation(Animation::OPACITY);
+  Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
   return animation && animation->is_impl_only();
 }
 
@@ -478,7 +481,7 @@
   if (!controller)
     return false;
 
-  Animation* animation = controller->GetAnimation(Animation::TRANSFORM);
+  Animation* animation = controller->GetAnimation(TargetProperty::TRANSFORM);
   return animation && animation->is_impl_only();
 }
 
diff --git a/cc/animation/animation_host.h b/cc/animation/animation_host.h
index 2cddf6a0..445209f 100644
--- a/cc/animation/animation_host.h
+++ b/cc/animation/animation_host.h
@@ -110,9 +110,8 @@
   bool HasPotentiallyRunningTransformAnimation(int layer_id,
                                                LayerTreeType tree_type) const;
 
-  bool HasAnyAnimationTargetingProperty(
-      int layer_id,
-      Animation::TargetProperty property) const;
+  bool HasAnyAnimationTargetingProperty(int layer_id,
+                                        TargetProperty::Type property) const;
 
   bool FilterIsAnimatingOnImplOnly(int layer_id) const;
   bool OpacityIsAnimatingOnImplOnly(int layer_id) const;
diff --git a/cc/animation/animation_player.cc b/cc/animation/animation_player.cc
index 52fa9a8..0c8ad3c 100644
--- a/cc/animation/animation_player.cc
+++ b/cc/animation/animation_player.cc
@@ -119,7 +119,7 @@
 }
 
 void AnimationPlayer::AddAnimation(scoped_ptr<Animation> animation) {
-  DCHECK(animation->target_property() != Animation::SCROLL_OFFSET ||
+  DCHECK(animation->target_property() != TargetProperty::SCROLL_OFFSET ||
          (animation_host_ && animation_host_->SupportsScrollAnimations()));
 
   if (element_animations_) {
@@ -160,8 +160,7 @@
   SetNeedsCommit();
 }
 
-void AnimationPlayer::AbortAnimations(
-    Animation::TargetProperty target_property) {
+void AnimationPlayer::AbortAnimations(TargetProperty::Type target_property) {
   if (element_animations_) {
     element_animations_->layer_animation_controller()->AbortAnimations(
         target_property);
@@ -187,7 +186,7 @@
 
 void AnimationPlayer::NotifyAnimationStarted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   if (layer_animation_delegate_)
     layer_animation_delegate_->NotifyAnimationStarted(monotonic_time,
@@ -196,7 +195,7 @@
 
 void AnimationPlayer::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   if (layer_animation_delegate_)
     layer_animation_delegate_->NotifyAnimationFinished(monotonic_time,
@@ -205,7 +204,7 @@
 
 void AnimationPlayer::NotifyAnimationAborted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   if (layer_animation_delegate_)
     layer_animation_delegate_->NotifyAnimationAborted(monotonic_time,
diff --git a/cc/animation/animation_player.h b/cc/animation/animation_player.h
index 7d04c56..97883ac 100644
--- a/cc/animation/animation_player.h
+++ b/cc/animation/animation_player.h
@@ -69,19 +69,19 @@
   void PauseAnimation(int animation_id, double time_offset);
   void RemoveAnimation(int animation_id);
   void AbortAnimation(int animation_id);
-  void AbortAnimations(Animation::TargetProperty target_property);
+  void AbortAnimations(TargetProperty::Type target_property);
 
   void PushPropertiesTo(AnimationPlayer* player_impl);
 
   // AnimationDelegate routing.
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group);
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group);
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group);
 
   // Whether this player has animations waiting to get sent to LAC.
diff --git a/cc/animation/animation_player_unittest.cc b/cc/animation/animation_player_unittest.cc
index d8030b3..6e165fd 100644
--- a/cc/animation/animation_player_unittest.cc
+++ b/cc/animation/animation_player_unittest.cc
@@ -123,18 +123,18 @@
   host_->PushPropertiesTo(host_impl_);
 
   EXPECT_FALSE(client_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                         Animation::OPACITY));
+                                         TargetProperty::OPACITY));
   EXPECT_FALSE(client_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                         Animation::TRANSFORM));
+                                         TargetProperty::TRANSFORM));
   EXPECT_FALSE(client_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                         Animation::FILTER));
+                                         TargetProperty::FILTER));
 
   EXPECT_FALSE(client_impl_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                              Animation::OPACITY));
+                                              TargetProperty::OPACITY));
   EXPECT_FALSE(client_impl_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                              Animation::TRANSFORM));
+                                              TargetProperty::TRANSFORM));
   EXPECT_FALSE(client_impl_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                              Animation::FILTER));
+                                              TargetProperty::FILTER));
 
   host_impl_->animation_registrar()->ActivateAnimations();
 
@@ -278,14 +278,14 @@
   host_->PushPropertiesTo(host_impl_);
 
   EXPECT_FALSE(client_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                         Animation::OPACITY));
+                                         TargetProperty::OPACITY));
   EXPECT_FALSE(client_impl_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                              Animation::OPACITY));
+                                              TargetProperty::OPACITY));
 
   EXPECT_FALSE(client_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                         Animation::FILTER));
+                                         TargetProperty::FILTER));
   EXPECT_FALSE(client_impl_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                              Animation::FILTER));
+                                              TargetProperty::FILTER));
 
   host_impl_->animation_registrar()->ActivateAnimations();
 
@@ -304,9 +304,9 @@
                                             end_opacity);
 
   EXPECT_FALSE(client_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                         Animation::FILTER));
+                                         TargetProperty::FILTER));
   EXPECT_FALSE(client_impl_.IsPropertyMutated(layer_id_, LayerTreeType::ACTIVE,
-                                              Animation::FILTER));
+                                              TargetProperty::FILTER));
 }
 
 TEST_F(AnimationPlayerTest, AddRemoveAnimationCausesSetNeedsCommit) {
diff --git a/cc/animation/animation_unittest.cc b/cc/animation/animation_unittest.cc
index 5a08912..3bb984a 100644
--- a/cc/animation/animation_unittest.cc
+++ b/cc/animation/animation_unittest.cc
@@ -23,7 +23,7 @@
                                       double playback_rate) {
   scoped_ptr<Animation> to_return(
       Animation::Create(make_scoped_ptr(new FakeFloatAnimationCurve(duration)),
-                        0, 1, Animation::OPACITY));
+                        0, 1, TargetProperty::OPACITY));
   to_return->set_iterations(iterations);
   to_return->set_playback_rate(playback_rate);
   return to_return;
diff --git a/cc/animation/element_animations.cc b/cc/animation/element_animations.cc
index cd3a736..e3c2224 100644
--- a/cc/animation/element_animations.cc
+++ b/cc/animation/element_animations.cc
@@ -239,7 +239,7 @@
 
 void ElementAnimations::NotifyAnimationStarted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   for (PlayersListNode* node = players_list_->head();
        node != players_list_->end(); node = node->next()) {
@@ -250,7 +250,7 @@
 
 void ElementAnimations::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   for (PlayersListNode* node = players_list_->head();
        node != players_list_->end(); node = node->next()) {
@@ -261,7 +261,7 @@
 
 void ElementAnimations::NotifyAnimationAborted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   for (PlayersListNode* node = players_list_->head();
        node != players_list_->end(); node = node->next()) {
diff --git a/cc/animation/element_animations.h b/cc/animation/element_animations.h
index 90090cfe..1c5ecc39 100644
--- a/cc/animation/element_animations.h
+++ b/cc/animation/element_animations.h
@@ -95,13 +95,13 @@
 
   // AnimationDelegate implementation
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override;
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override;
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override;
 
   // LayerAnimationValueProvider implementation.
diff --git a/cc/animation/layer_animation_controller.cc b/cc/animation/layer_animation_controller.cc
index 6aa254c..1e8aa02ea 100644
--- a/cc/animation/layer_animation_controller.cc
+++ b/cc/animation/layer_animation_controller.cc
@@ -66,7 +66,7 @@
 
   for (const auto& animation : animations_) {
     if (!animation->is_finished() &&
-        animation->target_property() == Animation::TRANSFORM) {
+        animation->target_property() == TargetProperty::TRANSFORM) {
       potentially_animating_transform_for_active_observers_ |=
           animation->affects_active_observers();
       potentially_animating_transform_for_pending_observers_ |=
@@ -99,9 +99,9 @@
         return animation->id() != animation_id;
       });
   for (auto it = animations_to_remove; it != animations_.end(); ++it) {
-    if ((*it)->target_property() == Animation::SCROLL_OFFSET) {
+    if ((*it)->target_property() == TargetProperty::SCROLL_OFFSET) {
       scroll_offset_animation_was_interrupted_ = true;
-    } else if ((*it)->target_property() == Animation::TRANSFORM &&
+    } else if ((*it)->target_property() == TargetProperty::TRANSFORM &&
                !(*it)->is_finished()) {
       removed_transform_animation = true;
     }
@@ -118,7 +118,7 @@
   if (Animation* animation = GetAnimationById(animation_id)) {
     if (!animation->is_finished()) {
       animation->SetRunState(Animation::ABORTED, last_tick_time_);
-      if (animation->target_property() == Animation::TRANSFORM)
+      if (animation->target_property() == TargetProperty::TRANSFORM)
         aborted_transform_animation = true;
     }
   }
@@ -127,13 +127,13 @@
 }
 
 void LayerAnimationController::AbortAnimations(
-    Animation::TargetProperty target_property) {
+    TargetProperty::Type target_property) {
   bool aborted_transform_animation = false;
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->target_property() == target_property &&
         !animations_[i]->is_finished()) {
       animations_[i]->SetRunState(Animation::ABORTED, last_tick_time_);
-      if (target_property == Animation::TRANSFORM)
+      if (target_property == TargetProperty::TRANSFORM)
         aborted_transform_animation = true;
     }
   }
@@ -190,9 +190,9 @@
     base::TimeDelta trimmed =
         animation->TrimTimeToCurrentIteration(monotonic_time);
     switch (animation->target_property()) {
-      case Animation::OPACITY: {
+      case TargetProperty::OPACITY: {
         AnimationEvent event(AnimationEvent::PROPERTY_UPDATE, id_,
-                             animation->group(), Animation::OPACITY,
+                             animation->group(), TargetProperty::OPACITY,
                              monotonic_time);
         const FloatAnimationCurve* float_animation_curve =
             animation->curve()->ToFloatAnimationCurve();
@@ -202,9 +202,9 @@
         break;
       }
 
-      case Animation::TRANSFORM: {
+      case TargetProperty::TRANSFORM: {
         AnimationEvent event(AnimationEvent::PROPERTY_UPDATE, id_,
-                             animation->group(), Animation::TRANSFORM,
+                             animation->group(), TargetProperty::TRANSFORM,
                              monotonic_time);
         const TransformAnimationCurve* transform_animation_curve =
             animation->curve()->ToTransformAnimationCurve();
@@ -214,9 +214,9 @@
         break;
       }
 
-      case Animation::FILTER: {
+      case TargetProperty::FILTER: {
         AnimationEvent event(AnimationEvent::PROPERTY_UPDATE, id_,
-                             animation->group(), Animation::FILTER,
+                             animation->group(), TargetProperty::FILTER,
                              monotonic_time);
         const FilterAnimationCurve* filter_animation_curve =
             animation->curve()->ToFilterAnimationCurve();
@@ -226,11 +226,11 @@
         break;
       }
 
-      case Animation::BACKGROUND_COLOR: {
+      case TargetProperty::BACKGROUND_COLOR: {
         break;
       }
 
-      case Animation::SCROLL_OFFSET: {
+      case TargetProperty::SCROLL_OFFSET: {
         // Impl-side changes to scroll offset are already sent back to the
         // main thread (e.g. for user-driven scrolling), so a PROPERTY_UPDATE
         // isn't needed.
@@ -271,7 +271,7 @@
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->affects_active_observers() !=
             animations_[i]->affects_pending_observers() &&
-        animations_[i]->target_property() == Animation::TRANSFORM)
+        animations_[i]->target_property() == TargetProperty::TRANSFORM)
       changed_transform_animation = true;
     animations_[i]->set_affects_active_observers(
         animations_[i]->affects_pending_observers());
@@ -291,7 +291,7 @@
 
 void LayerAnimationController::AddAnimation(scoped_ptr<Animation> animation) {
   bool added_transform_animation =
-      animation->target_property() == Animation::TRANSFORM;
+      animation->target_property() == TargetProperty::TRANSFORM;
   animations_.push_back(std::move(animation));
   needs_to_start_animations_ = true;
   UpdateActivation(NORMAL_ACTIVATION);
@@ -300,7 +300,7 @@
 }
 
 Animation* LayerAnimationController::GetAnimation(
-    Animation::TargetProperty target_property) const {
+    TargetProperty::Type target_property) const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     size_t index = animations_.size() - i - 1;
     if (animations_[index]->target_property() == target_property)
@@ -325,7 +325,7 @@
 }
 
 bool LayerAnimationController::IsPotentiallyAnimatingProperty(
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     ObserverType observer_type) const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (!animations_[i]->is_finished() &&
@@ -341,7 +341,7 @@
 }
 
 bool LayerAnimationController::IsCurrentlyAnimatingProperty(
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     ObserverType observer_type) const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (!animations_[i]->is_finished() &&
@@ -435,7 +435,7 @@
       if (layer_animation_delegate_)
         layer_animation_delegate_->NotifyAnimationAborted(
             event.monotonic_time, event.target_property, event.group_id);
-      if (event.target_property == Animation::TRANSFORM)
+      if (event.target_property == TargetProperty::TRANSFORM)
         aborted_transform_animation = true;
     }
   }
@@ -448,11 +448,11 @@
   bool notify_active_observers = true;
   bool notify_pending_observers = true;
   switch (event.target_property) {
-    case Animation::OPACITY:
+    case TargetProperty::OPACITY:
       NotifyObserversOpacityAnimated(
           event.opacity, notify_active_observers, notify_pending_observers);
       break;
-    case Animation::TRANSFORM:
+    case TargetProperty::TRANSFORM:
       NotifyObserversTransformAnimated(
           event.transform, notify_active_observers, notify_pending_observers);
       break;
@@ -486,7 +486,7 @@
 bool LayerAnimationController::HasFilterAnimationThatInflatesBounds() const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (!animations_[i]->is_finished() &&
-        animations_[i]->target_property() == Animation::FILTER &&
+        animations_[i]->target_property() == TargetProperty::FILTER &&
         animations_[i]
             ->curve()
             ->ToFilterAnimationCurve()
@@ -498,9 +498,9 @@
 }
 
 bool LayerAnimationController::HasTransformAnimationThatInflatesBounds() const {
-  return IsCurrentlyAnimatingProperty(Animation::TRANSFORM,
+  return IsCurrentlyAnimatingProperty(TargetProperty::TRANSFORM,
                                       ObserverType::ACTIVE) ||
-         IsCurrentlyAnimatingProperty(Animation::TRANSFORM,
+         IsCurrentlyAnimatingProperty(TargetProperty::TRANSFORM,
                                       ObserverType::PENDING);
 }
 
@@ -525,7 +525,7 @@
   *bounds = gfx::BoxF();
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->is_finished() ||
-        animations_[i]->target_property() != Animation::TRANSFORM)
+        animations_[i]->target_property() != TargetProperty::TRANSFORM)
       continue;
 
     const TransformAnimationCurve* transform_animation_curve =
@@ -544,7 +544,7 @@
 bool LayerAnimationController::HasAnimationThatAffectsScale() const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->is_finished() ||
-        animations_[i]->target_property() != Animation::TRANSFORM)
+        animations_[i]->target_property() != TargetProperty::TRANSFORM)
       continue;
 
     const TransformAnimationCurve* transform_animation_curve =
@@ -560,7 +560,7 @@
     ObserverType observer_type) const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->is_finished() ||
-        animations_[i]->target_property() != Animation::TRANSFORM)
+        animations_[i]->target_property() != TargetProperty::TRANSFORM)
       continue;
 
     if ((observer_type == ObserverType::ACTIVE &&
@@ -581,7 +581,7 @@
 bool LayerAnimationController::AnimationsPreserveAxisAlignment() const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->is_finished() ||
-        animations_[i]->target_property() != Animation::TRANSFORM)
+        animations_[i]->target_property() != TargetProperty::TRANSFORM)
       continue;
 
     const TransformAnimationCurve* transform_animation_curve =
@@ -598,7 +598,7 @@
   *start_scale = 0.f;
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->is_finished() ||
-        animations_[i]->target_property() != Animation::TRANSFORM)
+        animations_[i]->target_property() != TargetProperty::TRANSFORM)
       continue;
 
     if ((observer_type == ObserverType::ACTIVE &&
@@ -635,7 +635,7 @@
   *max_scale = 0.f;
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (animations_[i]->is_finished() ||
-        animations_[i]->target_property() != Animation::TRANSFORM)
+        animations_[i]->target_property() != TargetProperty::TRANSFORM)
       continue;
 
     if ((observer_type == ObserverType::ACTIVE &&
@@ -678,7 +678,7 @@
     if (controller_impl->GetAnimationById(animations_[i]->id()))
       continue;
 
-    if (animations_[i]->target_property() == Animation::SCROLL_OFFSET &&
+    if (animations_[i]->target_property() == TargetProperty::SCROLL_OFFSET &&
         !animations_[i]
              ->curve()
              ->ToScrollOffsetAnimationCurve()
@@ -728,7 +728,7 @@
   for (const auto& animation : animations) {
     if (IsCompleted(animation.get(), this)) {
       animation->set_affects_pending_observers(false);
-      if (animation->target_property() == Animation::TRANSFORM)
+      if (animation->target_property() == TargetProperty::TRANSFORM)
         removed_transform_animation = true;
     }
   }
@@ -884,7 +884,7 @@
     if (!animations_[i]->is_finished() &&
         animations_[i]->IsFinishedAt(monotonic_time)) {
       animations_[i]->SetRunState(Animation::FINISHED, monotonic_time);
-      if (animations_[i]->target_property() == Animation::TRANSFORM) {
+      if (animations_[i]->target_property() == TargetProperty::TRANSFORM) {
         finished_transform_animation = true;
       }
     }
@@ -1006,7 +1006,7 @@
                                     controller_impl->last_tick_time_);
         animation->SetRunState(Animation::WAITING_FOR_DELETION,
                                last_tick_time_);
-        if (animation_impl->target_property() == Animation::TRANSFORM) {
+        if (animation_impl->target_property() == TargetProperty::TRANSFORM) {
           aborted_transform_animation = true;
         }
       }
@@ -1038,7 +1038,7 @@
           animations_[i]->TrimTimeToCurrentIteration(monotonic_time);
 
       switch (animations_[i]->target_property()) {
-        case Animation::TRANSFORM: {
+        case TargetProperty::TRANSFORM: {
           const TransformAnimationCurve* transform_animation_curve =
               animations_[i]->curve()->ToTransformAnimationCurve();
           const gfx::Transform transform =
@@ -1050,7 +1050,7 @@
           break;
         }
 
-        case Animation::OPACITY: {
+        case TargetProperty::OPACITY: {
           const FloatAnimationCurve* float_animation_curve =
               animations_[i]->curve()->ToFloatAnimationCurve();
           const float opacity = std::max(
@@ -1062,7 +1062,7 @@
           break;
         }
 
-        case Animation::FILTER: {
+        case TargetProperty::FILTER: {
           const FilterAnimationCurve* filter_animation_curve =
               animations_[i]->curve()->ToFilterAnimationCurve();
           const FilterOperations filter =
@@ -1074,12 +1074,12 @@
           break;
         }
 
-        case Animation::BACKGROUND_COLOR: {
+        case TargetProperty::BACKGROUND_COLOR: {
           // Not yet implemented.
           break;
         }
 
-        case Animation::SCROLL_OFFSET: {
+        case TargetProperty::SCROLL_OFFSET: {
           const ScrollOffsetAnimationCurve* scroll_offset_animation_curve =
               animations_[i]->curve()->ToScrollOffsetAnimationCurve();
           const gfx::ScrollOffset scroll_offset =
diff --git a/cc/animation/layer_animation_controller.h b/cc/animation/layer_animation_controller.h
index 70c76d10..a364172c 100644
--- a/cc/animation/layer_animation_controller.h
+++ b/cc/animation/layer_animation_controller.h
@@ -47,7 +47,7 @@
   void PauseAnimation(int animation_id, base::TimeDelta time_offset);
   void RemoveAnimation(int animation_id);
   void AbortAnimation(int animation_id);
-  void AbortAnimations(Animation::TargetProperty target_property);
+  void AbortAnimations(TargetProperty::Type target_property);
 
   // Ensures that the list of active animations on the main thread and the impl
   // thread are kept in sync. This function does not take ownership of the impl
@@ -68,7 +68,7 @@
 
   // Returns the active animation animating the given property that is either
   // running, or is next to run, if such an animation exists.
-  Animation* GetAnimation(Animation::TargetProperty target_property) const;
+  Animation* GetAnimation(TargetProperty::Type target_property) const;
 
   // Returns the active animation for the given unique animation id.
   Animation* GetAnimationById(int animation_id) const;
@@ -83,12 +83,12 @@
   // Returns true if there is an animation that is either currently animating
   // the given property or scheduled to animate this property in the future, and
   // that affects the given observer type.
-  bool IsPotentiallyAnimatingProperty(Animation::TargetProperty target_property,
+  bool IsPotentiallyAnimatingProperty(TargetProperty::Type target_property,
                                       ObserverType observer_type) const;
 
   // Returns true if there is an animation that is currently animating the given
   // property and that affects the given observer type.
-  bool IsCurrentlyAnimatingProperty(Animation::TargetProperty target_property,
+  bool IsCurrentlyAnimatingProperty(TargetProperty::Type target_property,
                                     ObserverType observer_type) const;
 
   void SetAnimationRegistrar(AnimationRegistrar* registrar);
diff --git a/cc/animation/layer_animation_controller_unittest.cc b/cc/animation/layer_animation_controller_unittest.cc
index 2f5f37e..764b4709 100644
--- a/cc/animation/layer_animation_controller_unittest.cc
+++ b/cc/animation/layer_animation_controller_unittest.cc
@@ -38,7 +38,7 @@
 
 scoped_ptr<Animation> CreateAnimation(scoped_ptr<AnimationCurve> curve,
                                       int group_id,
-                                      Animation::TargetProperty property) {
+                                      TargetProperty::Type property) {
   return Animation::Create(std::move(curve), 0, group_id, property);
 }
 
@@ -52,7 +52,7 @@
       LayerAnimationController::Create(0));
   controller->AddValueObserver(&dummy);
 
-  EXPECT_FALSE(controller_impl->GetAnimation(Animation::OPACITY));
+  EXPECT_FALSE(controller_impl->GetAnimation(TargetProperty::OPACITY));
 
   EXPECT_FALSE(controller->needs_to_start_animations_for_testing());
   EXPECT_FALSE(controller_impl->needs_to_start_animations_for_testing());
@@ -85,7 +85,7 @@
   controller->AddValueObserver(&dummy);
   controller->set_value_provider(&dummy_provider);
 
-  EXPECT_FALSE(controller_impl->GetAnimation(Animation::SCROLL_OFFSET));
+  EXPECT_FALSE(controller_impl->GetAnimation(TargetProperty::SCROLL_OFFSET));
 
   EXPECT_FALSE(controller->needs_to_start_animations_for_testing());
   EXPECT_FALSE(controller_impl->needs_to_start_animations_for_testing());
@@ -103,7 +103,7 @@
   curve_fixed->SetInitialValue(initial_value);
   scoped_ptr<Animation> animation_fixed(
       Animation::Create(std::move(curve_fixed), 1 /* animation_id */, 0,
-                        Animation::SCROLL_OFFSET));
+                        TargetProperty::SCROLL_OFFSET));
   controller->AddAnimation(std::move(animation_fixed));
   controller->PushAnimationUpdatesTo(controller_impl.get());
   EXPECT_VECTOR2DF_EQ(initial_value, controller_impl->GetAnimationById(1)
@@ -115,8 +115,9 @@
   scoped_ptr<ScrollOffsetAnimationCurve> curve(
       ScrollOffsetAnimationCurve::Create(target_value,
                                          EaseInOutTimingFunction::Create()));
-  scoped_ptr<Animation> animation(Animation::Create(
-      std::move(curve), 2 /* animation id */, 0, Animation::SCROLL_OFFSET));
+  scoped_ptr<Animation> animation(
+      Animation::Create(std::move(curve), 2 /* animation id */, 0,
+                        TargetProperty::SCROLL_OFFSET));
   controller->AddAnimation(std::move(animation));
   controller->PushAnimationUpdatesTo(controller_impl.get());
   EXPECT_VECTOR2DF_EQ(provider_initial_value,
@@ -138,7 +139,7 @@
       LayerAnimationController::Create(0));
   controller->AddValueObserver(&dummy);
 
-  EXPECT_FALSE(controller_impl->GetAnimation(Animation::OPACITY));
+  EXPECT_FALSE(controller_impl->GetAnimation(TargetProperty::OPACITY));
 
   int animation_id =
       AddOpacityTransitionToController(controller.get(), 1, 0, 1, false);
@@ -181,7 +182,7 @@
       AddOpacityTransitionToController(controller.get(), 1, 0, 1, false);
 
   const TimeTicks start_time = TicksFromSecondsF(123);
-  controller->GetAnimation(Animation::OPACITY)->set_start_time(start_time);
+  controller->GetAnimation(TargetProperty::OPACITY)->set_start_time(start_time);
 
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
@@ -264,7 +265,7 @@
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(1000));
   controller->UpdateState(true, nullptr);
   EXPECT_EQ(Animation::FINISHED,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_EQ(1u, registrar->active_animation_controllers_for_testing().size());
 
   events.reset(new AnimationEvents);
@@ -272,8 +273,9 @@
                            TimeDelta::FromMilliseconds(1500));
   controller_impl->UpdateState(true, events.get());
 
-  EXPECT_EQ(Animation::WAITING_FOR_DELETION,
-            controller_impl->GetAnimation(Animation::OPACITY)->run_state());
+  EXPECT_EQ(
+      Animation::WAITING_FOR_DELETION,
+      controller_impl->GetAnimation(TargetProperty::OPACITY)->run_state());
   // The impl thread controller should have de-activated.
   EXPECT_EQ(0u,
             registrar_impl->active_animation_controllers_for_testing().size());
@@ -284,7 +286,7 @@
   controller->UpdateState(true, nullptr);
 
   EXPECT_EQ(Animation::WAITING_FOR_DELETION,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   // The main thread controller should have de-activated.
   EXPECT_EQ(0u, registrar->active_animation_controllers_for_testing().size());
 
@@ -310,7 +312,7 @@
       LayerAnimationController::Create(0));
   controller->AddValueObserver(&dummy);
 
-  EXPECT_FALSE(controller_impl->GetAnimation(Animation::OPACITY));
+  EXPECT_FALSE(controller_impl->GetAnimation(TargetProperty::OPACITY));
 
   // Two steps, three ranges: [0-1) -> 0.2, [1-2) -> 0.3, [2-3] -> 0.4.
   const double duration = 3.0;
@@ -387,7 +389,7 @@
   controller->AddValueObserver(&dummy);
   scoped_ptr<AnimationEvents> events(make_scoped_ptr(new AnimationEvents));
 
-  EXPECT_FALSE(controller_impl->GetAnimation(Animation::OPACITY));
+  EXPECT_FALSE(controller_impl->GetAnimation(TargetProperty::OPACITY));
 
   int animation_id =
       AddOpacityTransitionToController(controller.get(), 1, 0, 1, false);
@@ -471,8 +473,8 @@
   EXPECT_EQ(AnimationEvent::FINISHED, events->events_[0].type);
 
   // Neither controller should have deleted the animation yet.
-  EXPECT_TRUE(controller->GetAnimation(Animation::OPACITY));
-  EXPECT_TRUE(controller_impl->GetAnimation(Animation::OPACITY));
+  EXPECT_TRUE(controller->GetAnimation(TargetProperty::OPACITY));
+  EXPECT_TRUE(controller_impl->GetAnimation(TargetProperty::OPACITY));
 
   controller->NotifyAnimationFinished(events->events_[0]);
 
@@ -511,7 +513,7 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   EXPECT_FALSE(controller->needs_to_start_animations_for_testing());
   controller->AddAnimation(std::move(to_add));
@@ -541,7 +543,7 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   to_add->set_is_impl_only(true);
 
   controller_impl->AddAnimation(std::move(to_add));
@@ -589,7 +591,7 @@
       base::TimeDelta::FromSecondsD(1.0), operations, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), 1, 0, Animation::TRANSFORM));
+      Animation::Create(std::move(curve), 1, 0, TargetProperty::TRANSFORM));
   animation->set_is_impl_only(true);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -640,7 +642,7 @@
                                             end_filters, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), 1, 0, Animation::FILTER));
+      Animation::Create(std::move(curve), 1, 0, TargetProperty::FILTER));
   controller->AddAnimation(std::move(animation));
 
   controller->Animate(kInitialTickTime);
@@ -688,7 +690,7 @@
                                             end_filters, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), 1, 0, Animation::FILTER));
+      Animation::Create(std::move(curve), 1, 0, TargetProperty::FILTER));
   animation->set_is_impl_only(true);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -739,20 +741,21 @@
                                          EaseInOutTimingFunction::Create()));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+      Animation::Create(std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
   animation->set_needs_synchronized_start_time(true);
   controller->AddAnimation(std::move(animation));
 
   dummy_provider_impl.set_scroll_offset(initial_value);
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
-  EXPECT_TRUE(controller_impl->GetAnimation(Animation::SCROLL_OFFSET));
-  TimeDelta duration = controller_impl->GetAnimation(Animation::SCROLL_OFFSET)
-                           ->curve()
-                           ->Duration();
-  EXPECT_EQ(
-      duration,
-      controller->GetAnimation(Animation::SCROLL_OFFSET)->curve()->Duration());
+  EXPECT_TRUE(controller_impl->GetAnimation(TargetProperty::SCROLL_OFFSET));
+  TimeDelta duration =
+      controller_impl->GetAnimation(TargetProperty::SCROLL_OFFSET)
+          ->curve()
+          ->Duration();
+  EXPECT_EQ(duration, controller->GetAnimation(TargetProperty::SCROLL_OFFSET)
+                          ->curve()
+                          ->Duration());
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, nullptr);
@@ -816,20 +819,21 @@
                                          EaseInOutTimingFunction::Create()));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+      Animation::Create(std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
   animation->set_needs_synchronized_start_time(true);
   controller->AddAnimation(std::move(animation));
 
   dummy_provider.set_scroll_offset(initial_value);
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
-  EXPECT_TRUE(controller_impl->GetAnimation(Animation::SCROLL_OFFSET));
-  TimeDelta duration = controller_impl->GetAnimation(Animation::SCROLL_OFFSET)
-                           ->curve()
-                           ->Duration();
-  EXPECT_EQ(
-      duration,
-      controller->GetAnimation(Animation::SCROLL_OFFSET)->curve()->Duration());
+  EXPECT_TRUE(controller_impl->GetAnimation(TargetProperty::SCROLL_OFFSET));
+  TimeDelta duration =
+      controller_impl->GetAnimation(TargetProperty::SCROLL_OFFSET)
+          ->curve()
+          ->Duration();
+  EXPECT_EQ(duration, controller->GetAnimation(TargetProperty::SCROLL_OFFSET)
+                          ->curve()
+                          ->Duration());
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, nullptr);
@@ -886,7 +890,7 @@
   double duration_in_seconds = curve->Duration().InSecondsF();
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+      Animation::Create(std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
   animation->set_is_impl_only(true);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -939,7 +943,7 @@
 
   int animation_id = 1;
   scoped_ptr<Animation> animation(Animation::Create(
-      std::move(curve), animation_id, 0, Animation::SCROLL_OFFSET));
+      std::move(curve), animation_id, 0, TargetProperty::SCROLL_OFFSET));
   animation->set_needs_synchronized_start_time(true);
   controller->AddAnimation(std::move(animation));
   controller->PushAnimationUpdatesTo(controller_impl.get());
@@ -961,7 +965,7 @@
   curve = ScrollOffsetAnimationCurve::Create(target_value,
                                              EaseInOutTimingFunction::Create());
   animation = Animation::Create(std::move(curve), animation_id, 0,
-                                Animation::SCROLL_OFFSET);
+                                TargetProperty::SCROLL_OFFSET);
   animation->set_needs_synchronized_start_time(true);
   controller->AddAnimation(std::move(animation));
   controller->PushAnimationUpdatesTo(controller_impl.get());
@@ -1024,20 +1028,20 @@
         start_time_(base::TimeTicks()) {}
 
   void NotifyAnimationStarted(TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     started_ = true;
     start_time_ = monotonic_time;
   }
 
   void NotifyAnimationFinished(TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
     finished_ = true;
   }
 
   void NotifyAnimationAborted(TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     aborted_ = true;
   }
@@ -1071,7 +1075,7 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   to_add->set_is_impl_only(true);
   controller_impl->AddAnimation(std::move(to_add));
 
@@ -1111,7 +1115,7 @@
       AddOpacityTransitionToController(controller.get(), 1, 0, 1, false);
 
   const TimeTicks start_time = TicksFromSecondsF(123);
-  controller->GetAnimation(Animation::OPACITY)->set_start_time(start_time);
+  controller->GetAnimation(TargetProperty::OPACITY)->set_start_time(start_time);
 
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
@@ -1163,7 +1167,7 @@
       AddOpacityTransitionToController(controller.get(), 1, 0, 1, false);
 
   const TimeTicks start_time = TicksFromSecondsF(123);
-  controller->GetAnimation(Animation::OPACITY)->set_start_time(start_time);
+  controller->GetAnimation(TargetProperty::OPACITY)->set_start_time(start_time);
 
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
@@ -1196,7 +1200,7 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   to_add->set_needs_synchronized_start_time(true);
 
   // We should pause at the first keyframe indefinitely waiting for that
@@ -1217,7 +1221,7 @@
 
   // Send the synchronized start time.
   controller->NotifyAnimationStarted(
-      AnimationEvent(AnimationEvent::STARTED, 0, 1, Animation::OPACITY,
+      AnimationEvent(AnimationEvent::STARTED, 0, 1, TargetProperty::OPACITY,
                      kInitialTickTime + TimeDelta::FromMilliseconds(2000)));
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(5000));
   controller->UpdateState(true, events.get());
@@ -1237,10 +1241,10 @@
 
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 1.f, 0.5f)), 2,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   EXPECT_TRUE(controller->needs_to_start_animations_for_testing());
 
@@ -1275,7 +1279,7 @@
   controller->AddValueObserver(&dummy);
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, events.get());
   EXPECT_TRUE(controller->HasActiveAnimation());
@@ -1283,8 +1287,8 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 1.f, 0.5f)), 2,
-      Animation::OPACITY));
-  controller->AbortAnimations(Animation::OPACITY);
+      TargetProperty::OPACITY));
+  controller->AbortAnimations(TargetProperty::OPACITY);
   controller->AddAnimation(std::move(to_add));
 
   // Since the previous animation was aborted, the new animation should start
@@ -1310,13 +1314,13 @@
 
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1)), 1,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1)), 2,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 2,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, events.get());
@@ -1346,13 +1350,13 @@
 
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(2)), 1,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 1.f, 0.5f)), 2,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   // Animations with id 1 should both start now.
   controller->Animate(kInitialTickTime);
@@ -1386,7 +1390,7 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   to_add->set_iterations(3);
   controller->AddAnimation(std::move(to_add));
 
@@ -1431,7 +1435,7 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   to_add->set_iterations(-1);
   controller->AddAnimation(std::move(to_add));
 
@@ -1459,8 +1463,8 @@
   EXPECT_TRUE(controller->HasActiveAnimation());
   EXPECT_EQ(0.75f, dummy.opacity());
 
-  EXPECT_TRUE(controller->GetAnimation(Animation::OPACITY));
-  controller->GetAnimation(Animation::OPACITY)
+  EXPECT_TRUE(controller->GetAnimation(TargetProperty::OPACITY));
+  controller->GetAnimation(TargetProperty::OPACITY)
       ->SetRunState(Animation::ABORTED,
                     kInitialTickTime + TimeDelta::FromMilliseconds(750));
   EXPECT_FALSE(controller->HasActiveAnimation());
@@ -1477,7 +1481,7 @@
 
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, events.get());
@@ -1488,8 +1492,8 @@
   EXPECT_TRUE(controller->HasActiveAnimation());
   EXPECT_EQ(0.5f, dummy.opacity());
 
-  EXPECT_TRUE(controller->GetAnimation(Animation::OPACITY));
-  controller->GetAnimation(Animation::OPACITY)
+  EXPECT_TRUE(controller->GetAnimation(TargetProperty::OPACITY));
+  controller->GetAnimation(TargetProperty::OPACITY)
       ->SetRunState(Animation::PAUSED,
                     kInitialTickTime + TimeDelta::FromMilliseconds(500));
 
@@ -1498,8 +1502,8 @@
   EXPECT_TRUE(controller->HasActiveAnimation());
   EXPECT_EQ(0.5f, dummy.opacity());
 
-  EXPECT_TRUE(controller->GetAnimation(Animation::OPACITY));
-  controller->GetAnimation(Animation::OPACITY)
+  EXPECT_TRUE(controller->GetAnimation(TargetProperty::OPACITY));
+  controller->GetAnimation(TargetProperty::OPACITY)
       ->SetRunState(Animation::RUNNING,
                     kInitialTickTime + TimeDelta::FromMilliseconds(1024000));
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(1024250));
@@ -1523,13 +1527,13 @@
   const int animation_id = 2;
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1)), 1, 1,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(2.0, 0.f, 1.f)),
-      animation_id, 1, Animation::OPACITY));
+      animation_id, 1, TargetProperty::OPACITY));
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 1.f, 0.75f)), 3,
-      2, Animation::OPACITY));
+      2, TargetProperty::OPACITY));
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, events.get());
@@ -1567,21 +1571,22 @@
 
   scoped_ptr<Animation> to_add(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(2.0, 0.f, 1.f)), 0,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   to_add->set_needs_synchronized_start_time(true);
   controller->AddAnimation(std::move(to_add));
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, events.get());
   EXPECT_TRUE(controller->HasActiveAnimation());
-  Animation* active_animation = controller->GetAnimation(Animation::OPACITY);
+  Animation* active_animation =
+      controller->GetAnimation(TargetProperty::OPACITY);
   EXPECT_TRUE(active_animation);
   EXPECT_TRUE(active_animation->needs_synchronized_start_time());
 
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
 
-  active_animation = controller_impl->GetAnimation(Animation::OPACITY);
+  active_animation = controller_impl->GetAnimation(TargetProperty::OPACITY);
   EXPECT_TRUE(active_animation);
   EXPECT_EQ(Animation::WAITING_FOR_TARGET_AVAILABILITY,
             active_animation->run_state());
@@ -1597,7 +1602,7 @@
 
   scoped_ptr<Animation> first_animation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1)), 1,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   first_animation->set_is_controlling_instance_for_test(true);
   controller->AddAnimation(std::move(first_animation));
 
@@ -1606,7 +1611,7 @@
 
   scoped_ptr<Animation> second_animation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 2,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   second_animation->set_is_controlling_instance_for_test(true);
   controller->AddAnimation(std::move(second_animation));
 
@@ -1645,7 +1650,7 @@
   const int id = 1;
   controller->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.5f, 1.f)), id,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   // Without an observer, the animation shouldn't progress to the STARTING
   // state.
@@ -1653,7 +1658,7 @@
   controller->UpdateState(true, events.get());
   EXPECT_EQ(0u, events->events_.size());
   EXPECT_EQ(Animation::WAITING_FOR_TARGET_AVAILABILITY,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
 
   controller->AddValueObserver(&pending_dummy);
 
@@ -1664,7 +1669,7 @@
   controller->UpdateState(true, events.get());
   EXPECT_EQ(0u, events->events_.size());
   EXPECT_EQ(Animation::STARTING,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_EQ(0.5f, pending_dummy.opacity());
 
   // Even when already in the STARTING state, the animation should stay
@@ -1673,7 +1678,7 @@
   controller->UpdateState(true, events.get());
   EXPECT_EQ(0u, events->events_.size());
   EXPECT_EQ(Animation::STARTING,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_EQ(0.5f, pending_dummy.opacity());
 
   controller->AddValueObserver(&dummy);
@@ -1684,7 +1689,7 @@
   controller->UpdateState(true, events.get());
   EXPECT_EQ(1u, events->events_.size());
   EXPECT_EQ(Animation::RUNNING,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_EQ(0.5f, pending_dummy.opacity());
   EXPECT_EQ(0.5f, dummy.opacity());
 
@@ -1709,7 +1714,7 @@
       base::TimeDelta::FromSecondsD(1.0), operations1, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve1), 1, 1, Animation::TRANSFORM));
+      Animation::Create(std::move(curve1), 1, 1, TargetProperty::TRANSFORM));
   controller_impl->AddAnimation(std::move(animation));
 
   scoped_ptr<KeyframedTransformAnimationCurve> curve2(
@@ -1722,7 +1727,8 @@
   curve2->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations2, nullptr));
 
-  animation = Animation::Create(std::move(curve2), 2, 2, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve2), 2, 2, TargetProperty::TRANSFORM);
   controller_impl->AddAnimation(std::move(animation));
 
   gfx::BoxF box(1.f, 2.f, -1.f, 3.f, 4.f, 5.f);
@@ -1757,7 +1763,8 @@
   operations3.AppendMatrix(transform3);
   curve3->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations3, nullptr));
-  animation = Animation::Create(std::move(curve3), 3, 3, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve3), 3, 3, TargetProperty::TRANSFORM);
   controller_impl->AddAnimation(std::move(animation));
   EXPECT_FALSE(controller_impl->TransformAnimationBoundsForBox(box, &bounds));
 }
@@ -1774,19 +1781,19 @@
   // state.
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1.0)), 1, 1,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 2, 2,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1.0)), 3, 3,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(2.0)), 4, 4,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   controller->AddAnimation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 5, 5,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   controller->Animate(kInitialTickTime);
   controller->UpdateState(true, nullptr);
@@ -1800,7 +1807,7 @@
             controller->GetAnimationById(4)->run_state());
   EXPECT_EQ(Animation::RUNNING, controller->GetAnimationById(5)->run_state());
 
-  controller->AbortAnimations(Animation::TRANSFORM);
+  controller->AbortAnimations(TargetProperty::TRANSFORM);
 
   // Only un-finished TRANSFORM animations should have been aborted.
   EXPECT_EQ(Animation::FINISHED, controller->GetAnimationById(1)->run_state());
@@ -1828,9 +1835,9 @@
   controller_impl->ActivateAnimations();
   EXPECT_TRUE(controller_impl->GetAnimationById(animation_id));
 
-  controller->AbortAnimations(Animation::OPACITY);
+  controller->AbortAnimations(TargetProperty::OPACITY);
   EXPECT_EQ(Animation::ABORTED,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_FALSE(dummy.animation_waiting_for_deletion());
   EXPECT_FALSE(dummy_impl.animation_waiting_for_deletion());
 
@@ -1838,7 +1845,7 @@
   controller->UpdateState(true, nullptr);
   EXPECT_FALSE(dummy.animation_waiting_for_deletion());
   EXPECT_EQ(Animation::ABORTED,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
 
   controller->PushAnimationUpdatesTo(controller_impl.get());
   EXPECT_FALSE(controller->GetAnimationById(animation_id));
@@ -1865,9 +1872,10 @@
   controller_impl->ActivateAnimations();
   EXPECT_TRUE(controller_impl->GetAnimationById(animation_id));
 
-  controller_impl->AbortAnimations(Animation::OPACITY);
-  EXPECT_EQ(Animation::ABORTED,
-            controller_impl->GetAnimation(Animation::OPACITY)->run_state());
+  controller_impl->AbortAnimations(TargetProperty::OPACITY);
+  EXPECT_EQ(
+      Animation::ABORTED,
+      controller_impl->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_FALSE(dummy.animation_waiting_for_deletion());
   EXPECT_FALSE(dummy_impl.animation_waiting_for_deletion());
 
@@ -1877,19 +1885,20 @@
   EXPECT_TRUE(dummy_impl.animation_waiting_for_deletion());
   EXPECT_EQ(1u, events.events_.size());
   EXPECT_EQ(AnimationEvent::ABORTED, events.events_[0].type);
-  EXPECT_EQ(Animation::WAITING_FOR_DELETION,
-            controller_impl->GetAnimation(Animation::OPACITY)->run_state());
+  EXPECT_EQ(
+      Animation::WAITING_FOR_DELETION,
+      controller_impl->GetAnimation(TargetProperty::OPACITY)->run_state());
 
   controller->NotifyAnimationAborted(events.events_[0]);
   EXPECT_EQ(Animation::ABORTED,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
   EXPECT_TRUE(delegate.aborted());
 
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(500));
   controller->UpdateState(true, nullptr);
   EXPECT_TRUE(dummy.animation_waiting_for_deletion());
   EXPECT_EQ(Animation::WAITING_FOR_DELETION,
-            controller->GetAnimation(Animation::OPACITY)->run_state());
+            controller->GetAnimation(TargetProperty::OPACITY)->run_state());
 
   controller->PushAnimationUpdatesTo(controller_impl.get());
   controller_impl->ActivateAnimations();
@@ -1911,13 +1920,13 @@
   // Add two animations with the same group id but different durations.
   scoped_ptr<Animation> first_animation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(2.0)), 1, group_id,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   first_animation->set_is_controlling_instance_for_test(true);
   controller_impl->AddAnimation(std::move(first_animation));
 
   scoped_ptr<Animation> second_animation(Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 2,
-      group_id, Animation::OPACITY));
+      group_id, TargetProperty::OPACITY));
   second_animation->set_is_controlling_instance_for_test(true);
   controller_impl->AddAnimation(std::move(second_animation));
 
@@ -1965,13 +1974,13 @@
   // Add two animations with the same group id.
   scoped_ptr<Animation> first_animation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1.0)), 1,
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   first_animation->set_is_controlling_instance_for_test(true);
   controller_impl->AddAnimation(std::move(first_animation));
 
   scoped_ptr<Animation> second_animation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   second_animation->set_is_controlling_instance_for_test(true);
   controller_impl->AddAnimation(std::move(second_animation));
 
@@ -1983,7 +1992,7 @@
   EXPECT_EQ(AnimationEvent::STARTED, events->events_[0].type);
   EXPECT_EQ(AnimationEvent::STARTED, events->events_[1].type);
 
-  controller_impl->AbortAnimations(Animation::OPACITY);
+  controller_impl->AbortAnimations(TargetProperty::OPACITY);
 
   events.reset(new AnimationEvents);
   controller_impl->Animate(kInitialTickTime +
@@ -1994,9 +2003,9 @@
   // animation, and an ABORTED event for the opacity animation.
   EXPECT_EQ(2u, events->events_.size());
   EXPECT_EQ(AnimationEvent::FINISHED, events->events_[0].type);
-  EXPECT_EQ(Animation::TRANSFORM, events->events_[0].target_property);
+  EXPECT_EQ(TargetProperty::TRANSFORM, events->events_[0].target_property);
   EXPECT_EQ(AnimationEvent::ABORTED, events->events_[1].type);
-  EXPECT_EQ(Animation::OPACITY, events->events_[1].target_property);
+  EXPECT_EQ(TargetProperty::OPACITY, events->events_[1].target_property);
 }
 
 TEST(LayerAnimationControllerTest, HasAnimationThatAffectsScale) {
@@ -2007,7 +2016,7 @@
 
   controller_impl->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   // Opacity animations don't affect scale.
   EXPECT_FALSE(controller_impl->HasAnimationThatAffectsScale());
@@ -2023,7 +2032,7 @@
       base::TimeDelta::FromSecondsD(1.0), operations1, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve1), 2, 2, Animation::TRANSFORM));
+      Animation::Create(std::move(curve1), 2, 2, TargetProperty::TRANSFORM));
   controller_impl->AddAnimation(std::move(animation));
 
   // Translations don't affect scale.
@@ -2039,7 +2048,8 @@
   curve2->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations2, nullptr));
 
-  animation = Animation::Create(std::move(curve2), 3, 3, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve2), 3, 3, TargetProperty::TRANSFORM);
   controller_impl->AddAnimation(std::move(animation));
 
   EXPECT_TRUE(controller_impl->HasAnimationThatAffectsScale());
@@ -2063,7 +2073,7 @@
 
   controller_impl->AddAnimation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
 
   // Opacity animations aren't non-translation transforms.
   EXPECT_TRUE(controller_impl->HasOnlyTranslationTransforms(
@@ -2082,7 +2092,7 @@
       base::TimeDelta::FromSecondsD(1.0), operations1, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve1), 2, 2, Animation::TRANSFORM));
+      Animation::Create(std::move(curve1), 2, 2, TargetProperty::TRANSFORM));
   controller_impl->AddAnimation(std::move(animation));
 
   // The only transform animation we've added is a translation.
@@ -2101,7 +2111,8 @@
   curve2->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations2, nullptr));
 
-  animation = Animation::Create(std::move(curve2), 3, 3, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve2), 3, 3, TargetProperty::TRANSFORM);
   animation->set_affects_active_observers(false);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -2148,7 +2159,7 @@
   curve1->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations2, nullptr));
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve1), 1, 1, Animation::TRANSFORM));
+      Animation::Create(std::move(curve1), 1, 1, TargetProperty::TRANSFORM));
   animation->set_affects_active_observers(false);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -2179,7 +2190,8 @@
       base::TimeDelta::FromSecondsD(1.0), operations3, nullptr));
 
   controller_impl->RemoveAnimation(1);
-  animation = Animation::Create(std::move(curve2), 2, 2, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve2), 2, 2, TargetProperty::TRANSFORM);
 
   // Reverse Direction
   animation->set_direction(Animation::DIRECTION_REVERSE);
@@ -2197,7 +2209,8 @@
   curve3->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations5, nullptr));
 
-  animation = Animation::Create(std::move(curve3), 3, 3, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve3), 3, 3, TargetProperty::TRANSFORM);
   animation->set_affects_active_observers(false);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -2252,7 +2265,7 @@
       base::TimeDelta::FromSecondsD(1.0), operations1, nullptr));
 
   scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve1), 1, 1, Animation::TRANSFORM));
+      Animation::Create(std::move(curve1), 1, 1, TargetProperty::TRANSFORM));
   animation->set_affects_active_observers(false);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -2281,7 +2294,8 @@
   curve2->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations2, nullptr));
 
-  animation = Animation::Create(std::move(curve2), 2, 2, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve2), 2, 2, TargetProperty::TRANSFORM);
   animation->set_affects_active_observers(false);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -2310,7 +2324,8 @@
   curve3->AddKeyframe(TransformKeyframe::Create(
       base::TimeDelta::FromSecondsD(1.0), operations3, nullptr));
 
-  animation = Animation::Create(std::move(curve3), 3, 3, Animation::TRANSFORM);
+  animation =
+      Animation::Create(std::move(curve3), 3, 3, TargetProperty::TRANSFORM);
   animation->set_affects_active_observers(false);
   controller_impl->AddAnimation(std::move(animation));
 
@@ -2357,7 +2372,7 @@
       base::TimeDelta::FromSecondsD(1.0), operations2, nullptr));
 
   scoped_ptr<Animation> animation_owned(
-      Animation::Create(std::move(curve1), 1, 1, Animation::TRANSFORM));
+      Animation::Create(std::move(curve1), 1, 1, TargetProperty::TRANSFORM));
   Animation* animation = animation_owned.get();
   controller_impl->AddAnimation(std::move(animation_owned));
 
@@ -2661,7 +2676,7 @@
   controller->NotifyAnimationStarted(events.events_[0]);
   events.events_.clear();
 
-  controller_impl->AbortAnimations(Animation::TRANSFORM);
+  controller_impl->AbortAnimations(TargetProperty::TRANSFORM);
   EXPECT_FALSE(pending_dummy_impl.transform_is_animating());
   EXPECT_FALSE(active_dummy_impl.transform_is_animating());
 
@@ -2737,7 +2752,7 @@
 
   // Delete the animation on the main-thread controller.
   controller->RemoveAnimation(
-      controller->GetAnimation(Animation::OPACITY)->id());
+      controller->GetAnimation(TargetProperty::OPACITY)->id());
   controller->PushAnimationUpdatesTo(controller_impl.get());
 
   // The animation should no longer affect pending observers.
@@ -2785,7 +2800,7 @@
   // Remove the first animation from the main-thread controller, and add a
   // new animation affecting the same property.
   controller->RemoveAnimation(
-      controller->GetAnimation(Animation::OPACITY)->id());
+      controller->GetAnimation(TargetProperty::OPACITY)->id());
   int second_animation_id =
       AddOpacityTransitionToController(controller.get(), 1, 1.f, 0.5f, true);
   controller->PushAnimationUpdatesTo(controller_impl.get());
@@ -2849,49 +2864,53 @@
   // Create an animation that initially affects only pending observers.
   scoped_ptr<Animation> animation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   animation->set_affects_active_observers(false);
 
   controller->AddAnimation(std::move(animation));
   controller->Animate(kInitialTickTime);
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   controller->UpdateState(true, nullptr);
   EXPECT_TRUE(controller->HasActiveAnimation());
 
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE));
 
   controller->ActivateAnimations();
 
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE));
 
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(10));
   controller->UpdateState(true, nullptr);
 
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE));
 
   EXPECT_EQ(0.f, dummy.opacity());
 
@@ -2900,13 +2919,14 @@
   controller->UpdateState(true, nullptr);
 
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE));
 
   EXPECT_EQ(1.f, dummy.opacity());
 }
@@ -2921,7 +2941,7 @@
   // a start delay of 2 seconds.
   scoped_ptr<Animation> animation(CreateAnimation(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)), 1,
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   animation->set_fill_mode(Animation::FILL_MODE_NONE);
   animation->set_time_offset(TimeDelta::FromMilliseconds(-2000));
   animation->set_affects_active_observers(false);
@@ -2934,34 +2954,38 @@
   // potentially running transform animation but aren't currently animating
   // transform.
   EXPECT_TRUE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_TRUE(controller->HasActiveAnimation());
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE));
 
   controller->ActivateAnimations();
 
   EXPECT_TRUE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_TRUE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_TRUE(controller->HasActiveAnimation());
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE));
 
   controller->UpdateState(true, nullptr);
 
@@ -2969,13 +2993,15 @@
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(2000));
   controller->UpdateState(true, nullptr);
   EXPECT_TRUE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_TRUE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_TRUE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
 
   // After the animaton finishes, the observers it affects have neither a
   // potentially running transform animation nor a currently running transform
@@ -2983,13 +3009,15 @@
   controller->Animate(kInitialTickTime + TimeDelta::FromMilliseconds(4000));
   controller->UpdateState(true, nullptr);
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsPotentiallyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::PENDING));
+      TargetProperty::OPACITY,
+      LayerAnimationController::ObserverType::PENDING));
   EXPECT_FALSE(controller->IsCurrentlyAnimatingProperty(
-      Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
+      TargetProperty::OPACITY, LayerAnimationController::ObserverType::ACTIVE));
 }
 
 }  // namespace
diff --git a/cc/animation/target_property.cc b/cc/animation/target_property.cc
new file mode 100644
index 0000000..15144a7c
--- /dev/null
+++ b/cc/animation/target_property.cc
@@ -0,0 +1,28 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/animation/target_property.h"
+
+#include "base/macros.h"
+
+namespace cc {
+
+namespace {
+
+// This should match the TargetProperty enum.
+static const char* const s_targetPropertyNames[] = {
+    "TRANSFORM", "OPACITY", "FILTER", "SCROLL_OFFSET", "BACKGROUND_COLOR"};
+
+static_assert(static_cast<int>(TargetProperty::LAST_TARGET_PROPERTY) + 1 ==
+                  arraysize(s_targetPropertyNames),
+              "TargetPropertyEnumSize should equal the number of elements in "
+              "s_targetPropertyNames");
+
+}  // namespace
+
+const char* TargetProperty::GetName(TargetProperty::Type property) {
+  return s_targetPropertyNames[property];
+}
+
+}  // namespace cc
diff --git a/cc/animation/target_property.h b/cc/animation/target_property.h
new file mode 100644
index 0000000..e4658e1
--- /dev/null
+++ b/cc/animation/target_property.h
@@ -0,0 +1,28 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_ANIMATION_TARGET_PROPERTY_H_
+#define CC_ANIMATION_TARGET_PROPERTY_H_
+
+namespace cc {
+
+namespace TargetProperty {
+
+enum Type {
+  TRANSFORM = 0,
+  OPACITY,
+  FILTER,
+  SCROLL_OFFSET,
+  BACKGROUND_COLOR,
+  // This sentinel must be last.
+  LAST_TARGET_PROPERTY = BACKGROUND_COLOR
+};
+
+const char* GetName(TargetProperty::Type property);
+
+}  // namespace TargetProperty
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_TARGET_PROPERTY_H_
diff --git a/cc/blink/web_to_cc_animation_delegate_adapter.cc b/cc/blink/web_to_cc_animation_delegate_adapter.cc
index 97bc0b9..2ad069d4 100644
--- a/cc/blink/web_to_cc_animation_delegate_adapter.cc
+++ b/cc/blink/web_to_cc_animation_delegate_adapter.cc
@@ -14,7 +14,7 @@
 
 void WebToCCAnimationDelegateAdapter::NotifyAnimationStarted(
     base::TimeTicks monotonic_time,
-    cc::Animation::TargetProperty target_property,
+    cc::TargetProperty::Type target_property,
     int group) {
   delegate_->notifyAnimationStarted(
       (monotonic_time - base::TimeTicks()).InSecondsF(), group);
@@ -22,7 +22,7 @@
 
 void WebToCCAnimationDelegateAdapter::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
-    cc::Animation::TargetProperty target_property,
+    cc::TargetProperty::Type target_property,
     int group) {
   delegate_->notifyAnimationFinished(
       (monotonic_time - base::TimeTicks()).InSecondsF(), group);
@@ -30,7 +30,7 @@
 
 void WebToCCAnimationDelegateAdapter::NotifyAnimationAborted(
     base::TimeTicks monotonic_time,
-    cc::Animation::TargetProperty target_property,
+    cc::TargetProperty::Type target_property,
     int group) {
   delegate_->notifyAnimationAborted(
       (monotonic_time - base::TimeTicks()).InSecondsF(), group);
diff --git a/cc/blink/web_to_cc_animation_delegate_adapter.h b/cc/blink/web_to_cc_animation_delegate_adapter.h
index 343afa5..0978736 100644
--- a/cc/blink/web_to_cc_animation_delegate_adapter.h
+++ b/cc/blink/web_to_cc_animation_delegate_adapter.h
@@ -22,13 +22,13 @@
 
  private:
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              cc::Animation::TargetProperty target_property,
+                              cc::TargetProperty::Type target_property,
                               int group) override;
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               cc::Animation::TargetProperty target_property,
+                               cc::TargetProperty::Type target_property,
                                int group) override;
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              cc::Animation::TargetProperty target_property,
+                              cc::TargetProperty::Type target_property,
                               int group) override;
 
   blink::WebCompositorAnimationDelegate* delegate_;
diff --git a/cc/cc.gyp b/cc/cc.gyp
index 22c01e23..62afc299 100644
--- a/cc/cc.gyp
+++ b/cc/cc.gyp
@@ -63,6 +63,8 @@
         'animation/layer_animation_value_provider.h',
         'animation/scroll_offset_animation_curve.cc',
         'animation/scroll_offset_animation_curve.h',
+        'animation/target_property.cc',
+        'animation/target_property.h',
         'animation/timing_function.cc',
         'animation/timing_function.h',
         'animation/transform_operation.cc',
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index e7053a8..5a7796c8 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -507,7 +507,7 @@
   DCHECK(layer_tree_host_);
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
-                   Animation::FILTER,
+                   TargetProperty::FILTER,
                    LayerAnimationController::ObserverType::ACTIVE)
              : layer_tree_host_->IsAnimatingFilterProperty(this);
 }
@@ -515,7 +515,7 @@
 bool Layer::HasPotentiallyRunningFilterAnimation() const {
   if (layer_animation_controller_) {
     return layer_animation_controller_->IsPotentiallyAnimatingProperty(
-        Animation::FILTER, LayerAnimationController::ObserverType::ACTIVE);
+        TargetProperty::FILTER, LayerAnimationController::ObserverType::ACTIVE);
   }
   return layer_tree_host_->HasPotentiallyRunningFilterAnimation(this);
 }
@@ -544,7 +544,7 @@
   DCHECK(layer_tree_host_);
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
-                   Animation::OPACITY,
+                   TargetProperty::OPACITY,
                    LayerAnimationController::ObserverType::ACTIVE)
              : layer_tree_host_->IsAnimatingOpacityProperty(this);
 }
@@ -552,7 +552,8 @@
 bool Layer::HasPotentiallyRunningOpacityAnimation() const {
   if (layer_animation_controller_) {
     return layer_animation_controller_->IsPotentiallyAnimatingProperty(
-        Animation::OPACITY, LayerAnimationController::ObserverType::ACTIVE);
+        TargetProperty::OPACITY,
+        LayerAnimationController::ObserverType::ACTIVE);
   }
   return layer_tree_host_->HasPotentiallyRunningOpacityAnimation(this);
 }
@@ -756,7 +757,7 @@
   DCHECK(layer_tree_host_);
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
-                   Animation::TRANSFORM,
+                   TargetProperty::TRANSFORM,
                    LayerAnimationController::ObserverType::ACTIVE)
              : layer_tree_host_->IsAnimatingTransformProperty(this);
 }
@@ -764,7 +765,8 @@
 bool Layer::HasPotentiallyRunningTransformAnimation() const {
   if (layer_animation_controller_) {
     return layer_animation_controller_->IsPotentiallyAnimatingProperty(
-        Animation::TRANSFORM, LayerAnimationController::ObserverType::ACTIVE);
+        TargetProperty::TRANSFORM,
+        LayerAnimationController::ObserverType::ACTIVE);
   }
   return layer_tree_host_->HasPotentiallyRunningTransformAnimation(this);
 }
@@ -794,7 +796,7 @@
 }
 
 bool Layer::HasAnyAnimationTargetingProperty(
-    Animation::TargetProperty property) const {
+    TargetProperty::Type property) const {
   if (layer_animation_controller_)
     return !!layer_animation_controller_->GetAnimation(property);
 
@@ -1879,7 +1881,7 @@
   if (!layer_animation_controller_->animation_registrar())
     return false;
 
-  if (animation->target_property() == Animation::SCROLL_OFFSET &&
+  if (animation->target_property() == TargetProperty::SCROLL_OFFSET &&
       !layer_animation_controller_->animation_registrar()
            ->supports_scroll_animations())
     return false;
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index cdc0feee..afb5356 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -217,8 +217,7 @@
   void SetTransformOrigin(const gfx::Point3F&);
   gfx::Point3F transform_origin() const { return transform_origin_; }
 
-  bool HasAnyAnimationTargetingProperty(
-      Animation::TargetProperty property) const;
+  bool HasAnyAnimationTargetingProperty(TargetProperty::Type property) const;
 
   bool ScrollOffsetAnimationWasInterrupted() const;
 
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index b0515b0d..aa34a8d3 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -862,10 +862,10 @@
   if (scrollable())
     UpdatePropertyTreeScrollOffset();
 
-  if (HasAnyAnimationTargetingProperty(Animation::OPACITY))
+  if (HasAnyAnimationTargetingProperty(TargetProperty::OPACITY))
     UpdatePropertyTreeOpacity();
 
-  if (HasAnyAnimationTargetingProperty(Animation::TRANSFORM)) {
+  if (HasAnyAnimationTargetingProperty(TargetProperty::TRANSFORM)) {
     UpdatePropertyTreeTransform();
     UpdatePropertyTreeTransformIsAnimated(
         HasPotentiallyRunningTransformAnimation());
@@ -1081,7 +1081,7 @@
                  : LayerAnimationController::ObserverType::PENDING;
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
-                   Animation::FILTER, observer_type)
+                   TargetProperty::FILTER, observer_type)
              : layer_tree_impl_->IsAnimatingFilterProperty(this);
 }
 
@@ -1091,7 +1091,7 @@
                  : LayerAnimationController::ObserverType::PENDING;
   return layer_animation_controller_
              ? layer_animation_controller_->IsPotentiallyAnimatingProperty(
-                   Animation::FILTER, observer_type)
+                   TargetProperty::FILTER, observer_type)
              : layer_tree_impl_->HasPotentiallyRunningFilterAnimation(this);
 }
 
@@ -1100,7 +1100,7 @@
     return layer_tree_impl_->FilterIsAnimatingOnImplOnly(this);
 
   Animation* filter_animation =
-      layer_animation_controller_->GetAnimation(Animation::FILTER);
+      layer_animation_controller_->GetAnimation(TargetProperty::FILTER);
   return filter_animation && filter_animation->is_impl_only();
 }
 
@@ -1145,7 +1145,7 @@
                  : LayerAnimationController::ObserverType::PENDING;
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
-                   Animation::OPACITY, observer_type)
+                   TargetProperty::OPACITY, observer_type)
              : layer_tree_impl_->IsAnimatingOpacityProperty(this);
 }
 
@@ -1155,7 +1155,7 @@
                  : LayerAnimationController::ObserverType::PENDING;
   return layer_animation_controller_
              ? layer_animation_controller_->IsPotentiallyAnimatingProperty(
-                   Animation::OPACITY, observer_type)
+                   TargetProperty::OPACITY, observer_type)
              : layer_tree_impl_->HasPotentiallyRunningOpacityAnimation(this);
 }
 
@@ -1164,7 +1164,7 @@
     return layer_tree_impl_->OpacityIsAnimatingOnImplOnly(this);
 
   Animation* opacity_animation =
-      layer_animation_controller_->GetAnimation(Animation::OPACITY);
+      layer_animation_controller_->GetAnimation(TargetProperty::OPACITY);
   return opacity_animation && opacity_animation->is_impl_only();
 }
 
@@ -1267,7 +1267,7 @@
                  : LayerAnimationController::ObserverType::PENDING;
   return layer_animation_controller_
              ? layer_animation_controller_->IsCurrentlyAnimatingProperty(
-                   Animation::TRANSFORM, observer_type)
+                   TargetProperty::TRANSFORM, observer_type)
              : layer_tree_impl_->IsAnimatingTransformProperty(this);
 }
 
@@ -1277,7 +1277,7 @@
                  : LayerAnimationController::ObserverType::PENDING;
   return layer_animation_controller_
              ? layer_animation_controller_->IsPotentiallyAnimatingProperty(
-                   Animation::TRANSFORM, observer_type)
+                   TargetProperty::TRANSFORM, observer_type)
              : layer_tree_impl_->HasPotentiallyRunningTransformAnimation(this);
 }
 
@@ -1286,7 +1286,7 @@
     return layer_tree_impl_->TransformIsAnimatingOnImplOnly(this);
 
   Animation* transform_animation =
-      layer_animation_controller_->GetAnimation(Animation::TRANSFORM);
+      layer_animation_controller_->GetAnimation(TargetProperty::TRANSFORM);
   return transform_animation && transform_animation->is_impl_only();
 }
 
@@ -1330,7 +1330,7 @@
 }
 
 bool LayerImpl::HasAnyAnimationTargetingProperty(
-    Animation::TargetProperty property) const {
+    TargetProperty::Type property) const {
   if (!layer_animation_controller_)
     return layer_tree_impl_->HasAnyAnimationTargetingProperty(this, property);
 
@@ -1691,11 +1691,10 @@
   return num_descendants_that_draw_content_;
 }
 
-void LayerImpl::NotifyAnimationFinished(
-    base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
-    int group) {
-  if (target_property == Animation::SCROLL_OFFSET)
+void LayerImpl::NotifyAnimationFinished(base::TimeTicks monotonic_time,
+                                        TargetProperty::Type target_property,
+                                        int group) {
+  if (target_property == TargetProperty::SCROLL_OFFSET)
     layer_tree_impl_->InputScrollAnimationFinished();
 }
 
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index d4bf384..b5f2ee2 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -119,13 +119,13 @@
 
   // AnimationDelegate implementation.
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override{};
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override;
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override{};
 
   // Tree structure.
@@ -548,8 +548,7 @@
 
   // This includes all animations, even those that are finished but haven't yet
   // been deleted.
-  bool HasAnyAnimationTargetingProperty(
-      Animation::TargetProperty property) const;
+  bool HasAnyAnimationTargetingProperty(TargetProperty::Type property) const;
 
   bool HasFilterAnimationThatInflatesBounds() const;
   bool HasTransformAnimationThatInflatesBounds() const;
diff --git a/cc/layers/layer_unittest.cc b/cc/layers/layer_unittest.cc
index 1b10a914..b393af3f 100644
--- a/cc/layers/layer_unittest.cc
+++ b/cc/layers/layer_unittest.cc
@@ -1759,7 +1759,7 @@
     AddOpacityTransitionToController(impl_layer->layer_animation_controller(),
                                      1.0, 0.3f, 0.7f, false);
     impl_layer->layer_animation_controller()
-        ->GetAnimation(Animation::OPACITY)
+        ->GetAnimation(TargetProperty::OPACITY)
         ->set_is_impl_only(true);
   }
   EXPECT_SET_NEEDS_COMMIT(1, test_layer->SetOpacity(0.75f));
@@ -1810,7 +1810,7 @@
     AddAnimatedFilterToController(impl_layer->layer_animation_controller(), 1.0,
                                   1.f, 2.f);
     impl_layer->layer_animation_controller()
-        ->GetAnimation(Animation::FILTER)
+        ->GetAnimation(TargetProperty::FILTER)
         ->set_is_impl_only(true);
   }
   filters.Append(FilterOperation::CreateSepiaFilter(0.5f));
@@ -2144,7 +2144,7 @@
   curve->AddKeyframe(
       FloatKeyframe::Create(base::TimeDelta::FromSecondsD(1.0), 0.7f, nullptr));
   scoped_ptr<Animation> animation =
-      Animation::Create(std::move(curve), 0, 0, Animation::OPACITY);
+      Animation::Create(std::move(curve), 0, 0, TargetProperty::OPACITY);
 
   return layer->AddAnimation(std::move(animation));
 }
diff --git a/cc/test/animation_test_common.cc b/cc/test/animation_test_common.cc
index f61e9bb..cc02e633 100644
--- a/cc/test/animation_test_common.cc
+++ b/cc/test/animation_test_common.cc
@@ -47,7 +47,7 @@
 
   scoped_ptr<Animation> animation(Animation::Create(
       std::move(curve), id, AnimationIdProvider::NextGroupId(),
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   animation->set_needs_synchronized_start_time(true);
 
   target->AddAnimation(std::move(animation));
@@ -74,7 +74,7 @@
 
   scoped_ptr<Animation> animation(Animation::Create(
       std::move(curve), id, AnimationIdProvider::NextGroupId(),
-      Animation::TRANSFORM));
+      TargetProperty::TRANSFORM));
   animation->set_needs_synchronized_start_time(true);
 
   target->AddAnimation(std::move(animation));
@@ -119,9 +119,9 @@
 
   int id = AnimationIdProvider::NextAnimationId();
 
-  scoped_ptr<Animation> animation(
-      Animation::Create(std::move(curve), id,
-                        AnimationIdProvider::NextGroupId(), Animation::FILTER));
+  scoped_ptr<Animation> animation(Animation::Create(
+      std::move(curve), id, AnimationIdProvider::NextGroupId(),
+      TargetProperty::FILTER));
   animation->set_needs_synchronized_start_time(true);
 
   target->AddAnimation(std::move(animation));
@@ -417,7 +417,7 @@
 
   scoped_ptr<Animation> animation(Animation::Create(
       std::move(curve), id, AnimationIdProvider::NextGroupId(),
-      Animation::OPACITY));
+      TargetProperty::OPACITY));
   animation->set_needs_synchronized_start_time(true);
 
   target->AddAnimation(std::move(animation));
@@ -525,10 +525,9 @@
                                       end_opacity, use_timing_function);
 }
 
-void AbortAnimationsOnLayerWithPlayer(
-    int layer_id,
-    scoped_refptr<AnimationTimeline> timeline,
-    Animation::TargetProperty target_property) {
+void AbortAnimationsOnLayerWithPlayer(int layer_id,
+                                      scoped_refptr<AnimationTimeline> timeline,
+                                      TargetProperty::Type target_property) {
   LayerAnimationController* controller =
       timeline->animation_host()->GetControllerForLayerId(layer_id);
   DCHECK(controller);
diff --git a/cc/test/animation_test_common.h b/cc/test/animation_test_common.h
index 19e7a7c..7a6fe0d8 100644
--- a/cc/test/animation_test_common.h
+++ b/cc/test/animation_test_common.h
@@ -260,10 +260,9 @@
     float end_opacity,
     bool use_timing_function);
 
-void AbortAnimationsOnLayerWithPlayer(
-    int layer_id,
-    scoped_refptr<AnimationTimeline> timeline,
-    Animation::TargetProperty target_property);
+void AbortAnimationsOnLayerWithPlayer(int layer_id,
+                                      scoped_refptr<AnimationTimeline> timeline,
+                                      TargetProperty::Type target_property);
 
 }  // namespace cc
 
diff --git a/cc/test/animation_timelines_test_common.cc b/cc/test/animation_timelines_test_common.cc
index d3b80f6..f9417360 100644
--- a/cc/test/animation_timelines_test_common.cc
+++ b/cc/test/animation_timelines_test_common.cc
@@ -31,7 +31,7 @@
   opacity_ = 0;
   brightness_ = 0;
 
-  for (int i = 0; i <= Animation::LAST_TARGET_PROPERTY; ++i)
+  for (int i = 0; i <= TargetProperty::LAST_TARGET_PROPERTY; ++i)
     mutated_properties_[i] = false;
 }
 
@@ -129,10 +129,9 @@
   layers_in_tree.erase(kv);
 }
 
-bool TestHostClient::IsPropertyMutated(
-    int layer_id,
-    LayerTreeType tree_type,
-    Animation::TargetProperty property) const {
+bool TestHostClient::IsPropertyMutated(int layer_id,
+                                       LayerTreeType tree_type,
+                                       TargetProperty::Type property) const {
   TestLayer* layer = FindTestLayer(layer_id, tree_type);
   return layer->is_property_mutated(property);
 }
@@ -141,7 +140,7 @@
                                                  LayerTreeType tree_type,
                                                  float brightness) const {
   TestLayer* layer = FindTestLayer(layer_id, tree_type);
-  EXPECT_TRUE(layer->is_property_mutated(Animation::OPACITY));
+  EXPECT_TRUE(layer->is_property_mutated(TargetProperty::OPACITY));
   EXPECT_EQ(brightness, layer->brightness());
 }
 
@@ -149,7 +148,7 @@
                                                   LayerTreeType tree_type,
                                                   float opacity) const {
   TestLayer* layer = FindTestLayer(layer_id, tree_type);
-  EXPECT_TRUE(layer->is_property_mutated(Animation::OPACITY));
+  EXPECT_TRUE(layer->is_property_mutated(TargetProperty::OPACITY));
   EXPECT_EQ(opacity, layer->opacity());
 }
 
@@ -158,7 +157,7 @@
                                                     int transform_x,
                                                     int transform_y) const {
   TestLayer* layer = FindTestLayer(layer_id, tree_type);
-  EXPECT_TRUE(layer->is_property_mutated(Animation::OPACITY));
+  EXPECT_TRUE(layer->is_property_mutated(TargetProperty::OPACITY));
   EXPECT_EQ(transform_x, layer->transform_x());
   EXPECT_EQ(transform_y, layer->transform_y());
 }
@@ -180,13 +179,13 @@
 
 void TestAnimationDelegate::NotifyAnimationStarted(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   started_ = true;
 }
 void TestAnimationDelegate::NotifyAnimationFinished(
     base::TimeTicks monotonic_time,
-    Animation::TargetProperty target_property,
+    TargetProperty::Type target_property,
     int group) {
   finished_ = true;
 }
diff --git a/cc/test/animation_timelines_test_common.h b/cc/test/animation_timelines_test_common.h
index 2f1388e..0d041b5 100644
--- a/cc/test/animation_timelines_test_common.h
+++ b/cc/test/animation_timelines_test_common.h
@@ -29,28 +29,28 @@
   void set_transform(int transform_x, int transform_y) {
     transform_x_ = transform_x;
     transform_y_ = transform_y;
-    mutated_properties_[Animation::TRANSFORM] = true;
+    mutated_properties_[TargetProperty::TRANSFORM] = true;
   }
 
   float opacity() const { return opacity_; }
   void set_opacity(float opacity) {
     opacity_ = opacity;
-    mutated_properties_[Animation::OPACITY] = true;
+    mutated_properties_[TargetProperty::OPACITY] = true;
   }
 
   float brightness() const { return brightness_; }
   void set_brightness(float brightness) {
     brightness_ = brightness;
-    mutated_properties_[Animation::FILTER] = true;
+    mutated_properties_[TargetProperty::FILTER] = true;
   }
 
   gfx::ScrollOffset scroll_offset() const { return scroll_offset_; }
   void set_scroll_offset(const gfx::ScrollOffset& scroll_offset) {
     scroll_offset_ = scroll_offset;
-    mutated_properties_[Animation::SCROLL_OFFSET] = true;
+    mutated_properties_[TargetProperty::SCROLL_OFFSET] = true;
   }
 
-  bool is_property_mutated(Animation::TargetProperty property) const {
+  bool is_property_mutated(TargetProperty::Type property) const {
     return mutated_properties_[property];
   }
 
@@ -64,7 +64,7 @@
   float brightness_;
   gfx::ScrollOffset scroll_offset_;
 
-  bool mutated_properties_[Animation::LAST_TARGET_PROPERTY + 1];
+  bool mutated_properties_[TargetProperty::LAST_TARGET_PROPERTY + 1];
 };
 
 class TestHostClient : public MutatorHostClient {
@@ -117,7 +117,7 @@
 
   bool IsPropertyMutated(int layer_id,
                          LayerTreeType tree_type,
-                         Animation::TargetProperty property) const;
+                         TargetProperty::Type property) const;
 
   void ExpectFilterPropertyMutated(int layer_id,
                                    LayerTreeType tree_type,
@@ -147,13 +147,13 @@
   TestAnimationDelegate();
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override;
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override;
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {}
   bool started_;
   bool finished_;
diff --git a/cc/test/test_hooks.h b/cc/test/test_hooks.h
index 30ebece..a00233dc 100644
--- a/cc/test/test_hooks.h
+++ b/cc/test/test_hooks.h
@@ -129,13 +129,13 @@
 
   // Implementation of AnimationDelegate:
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {}
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {}
   void NotifyAnimationAborted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {}
 
   virtual void RequestNewOutputSurface() = 0;
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 42a97ea..2dff375 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -1388,7 +1388,7 @@
 
 bool LayerTreeHost::HasAnyAnimationTargetingProperty(
     const Layer* layer,
-    Animation::TargetProperty property) const {
+    TargetProperty::Type property) const {
   return animation_host_
              ? animation_host_->HasAnyAnimationTargetingProperty(layer->id(),
                                                                  property)
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 453c75f..c9850023 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -397,9 +397,8 @@
   bool HasOnlyTranslationTransforms(const Layer* layer) const;
   bool MaximumTargetScale(const Layer* layer, float* max_scale) const;
   bool AnimationStartScale(const Layer* layer, float* start_scale) const;
-  bool HasAnyAnimationTargetingProperty(
-      const Layer* layer,
-      Animation::TargetProperty property) const;
+  bool HasAnyAnimationTargetingProperty(const Layer* layer,
+                                        TargetProperty::Type property) const;
   bool AnimationsPreserveAxisAlignment(const Layer* layer) const;
   bool HasAnyAnimation(const Layer* layer) const;
   bool HasActiveAnimation(const Layer* layer) const;
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index b80902a6..69a8ce7 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -2626,7 +2626,7 @@
   // Add a transform animation with a start delay to |grand_child|.
   scoped_ptr<Animation> animation = Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1.0)), 0, 1,
-      Animation::TRANSFORM);
+      TargetProperty::TRANSFORM);
   animation->set_fill_mode(Animation::FILL_MODE_NONE);
   animation->set_time_offset(base::TimeDelta::FromMilliseconds(-1000));
   if (layer_settings().use_compositor_animation_timelines) {
@@ -7553,18 +7553,18 @@
 
   if (layer_settings().use_compositor_animation_timelines) {
     AbortAnimationsOnLayerWithPlayer(grand_parent->id(), timeline,
-                                     Animation::TRANSFORM);
+                                     TargetProperty::TRANSFORM);
     AbortAnimationsOnLayerWithPlayer(parent_raw->id(), timeline,
-                                     Animation::TRANSFORM);
+                                     TargetProperty::TRANSFORM);
     AbortAnimationsOnLayerWithPlayer(child_raw->id(), timeline,
-                                     Animation::TRANSFORM);
+                                     TargetProperty::TRANSFORM);
   } else {
     grand_parent->layer_animation_controller()->AbortAnimations(
-        Animation::TRANSFORM);
+        TargetProperty::TRANSFORM);
     parent_raw->layer_animation_controller()->AbortAnimations(
-        Animation::TRANSFORM);
+        TargetProperty::TRANSFORM);
     child_raw->layer_animation_controller()->AbortAnimations(
-        Animation::TRANSFORM);
+        TargetProperty::TRANSFORM);
   }
 
   TransformOperations perspective;
@@ -7602,10 +7602,10 @@
 
   if (layer_settings().use_compositor_animation_timelines) {
     AbortAnimationsOnLayerWithPlayer(child_raw->id(), timeline,
-                                     Animation::TRANSFORM);
+                                     TargetProperty::TRANSFORM);
   } else {
     child_raw->layer_animation_controller()->AbortAnimations(
-        Animation::TRANSFORM);
+        TargetProperty::TRANSFORM);
   }
   gfx::Transform scale_matrix;
   scale_matrix.Scale(1.f, 2.f);
@@ -8522,7 +8522,7 @@
   curve->AddKeyframe(FilterKeyframe::Create(
       base::TimeDelta::FromMilliseconds(100), end_filters, nullptr));
   scoped_ptr<Animation> animation =
-      Animation::Create(std::move(curve), 0, 1, Animation::FILTER);
+      Animation::Create(std::move(curve), 0, 1, TargetProperty::FILTER);
   animation->set_fill_mode(Animation::FILL_MODE_NONE);
   animation->set_time_offset(base::TimeDelta::FromMilliseconds(-1000));
 
@@ -9003,7 +9003,7 @@
   int animation_id = 0;
   scoped_ptr<Animation> animation = Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeTransformTransition(1.0)),
-      animation_id, 1, Animation::TRANSFORM);
+      animation_id, 1, TargetProperty::TRANSFORM);
   animation->set_fill_mode(Animation::FILL_MODE_NONE);
   animation->set_time_offset(base::TimeDelta::FromMilliseconds(-1000));
   if (layer_settings().use_compositor_animation_timelines) {
@@ -9040,7 +9040,7 @@
   animation_id = 1;
   animation = Animation::Create(
       scoped_ptr<AnimationCurve>(new FakeFloatTransition(1.0, 0.f, 1.f)),
-      animation_id, 1, Animation::OPACITY);
+      animation_id, 1, TargetProperty::OPACITY);
   animation->set_fill_mode(Animation::FILL_MODE_NONE);
   animation->set_time_offset(base::TimeDelta::FromMilliseconds(-1000));
   if (layer_settings().use_compositor_animation_timelines) {
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 0ffe578..8b12272 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -3750,7 +3750,7 @@
     return animation_host_->ScrollAnimationAbort();
 
   layer_impl->layer_animation_controller()->AbortAnimations(
-      Animation::SCROLL_OFFSET);
+      TargetProperty::SCROLL_OFFSET);
 }
 
 void LayerTreeHostImpl::ScrollAnimationCreate(
@@ -3771,7 +3771,7 @@
 
   scoped_ptr<Animation> animation = Animation::Create(
       std::move(curve), AnimationIdProvider::NextAnimationId(),
-      AnimationIdProvider::NextGroupId(), Animation::SCROLL_OFFSET);
+      AnimationIdProvider::NextGroupId(), TargetProperty::SCROLL_OFFSET);
   animation->set_is_impl_only(true);
 
   layer_impl->layer_animation_controller()->AddAnimation(std::move(animation));
@@ -3792,7 +3792,7 @@
   Animation* animation =
       layer_impl->layer_animation_controller()
           ? layer_impl->layer_animation_controller()->GetAnimation(
-                Animation::SCROLL_OFFSET)
+                TargetProperty::SCROLL_OFFSET)
           : nullptr;
   if (!animation)
     return false;
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index d7fc121..d155c5b0 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -9403,7 +9403,7 @@
   host_impl_->UpdateAnimationState(true);
 
   EXPECT_TRUE(host_impl_->animation_host()->HasAnyAnimationTargetingProperty(
-      scrolling_layer->id(), Animation::SCROLL_OFFSET));
+      scrolling_layer->id(), TargetProperty::SCROLL_OFFSET));
 
   EXPECT_EQ(gfx::ScrollOffset(), scrolling_layer->CurrentScrollOffset());
   host_impl_->DidFinishImplFrame();
diff --git a/cc/trees/layer_tree_host_unittest_animation.cc b/cc/trees/layer_tree_host_unittest_animation.cc
index 3e269c3..bc68df8 100644
--- a/cc/trees/layer_tree_host_unittest_animation.cc
+++ b/cc/trees/layer_tree_host_unittest_animation.cc
@@ -136,13 +136,13 @@
   }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     EXPECT_LT(base::TimeTicks(), monotonic_time);
 
     LayerAnimationController* controller =
         layer_tree_host()->root_layer()->layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     if (animation)
       controller->RemoveAnimation(animation->id());
 
@@ -220,7 +220,7 @@
   }
 
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
     // Animations on the impl-side controller only get deleted during a commit,
     // so we need to schedule a commit.
@@ -258,7 +258,8 @@
     LayerAnimationController* controller_impl =
         host_impl->active_tree()->root_layer()->children()[0]->
         layer_animation_controller();
-    Animation* animation = controller_impl->GetAnimation(Animation::OPACITY);
+    Animation* animation =
+        controller_impl->GetAnimation(TargetProperty::OPACITY);
     if (!animation)
       return;
 
@@ -303,12 +304,12 @@
   void BeginTest() override { PostAddAnimationToMainThread(picture_.get()); }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     LayerAnimationController* controller =
         layer_tree_host()->root_layer()->children()[0]->
         layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     main_start_time_ = animation->start_time();
     controller->RemoveAnimation(animation->id());
     EndTest();
@@ -319,7 +320,7 @@
     LayerAnimationController* controller =
         impl_host->active_tree()->root_layer()->children()[0]->
         layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     if (!animation)
       return;
 
@@ -350,11 +351,11 @@
   }
 
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
     LayerAnimationController* controller =
         layer_tree_host()->root_layer()->layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     if (animation)
       controller->RemoveAnimation(animation->id());
     EndTest();
@@ -390,7 +391,7 @@
     LayerAnimationController* controller_impl =
         host_impl->active_tree()->root_layer()->layer_animation_controller();
     Animation* animation_impl =
-        controller_impl->GetAnimation(Animation::OPACITY);
+        controller_impl->GetAnimation(TargetProperty::OPACITY);
     controller_impl->RemoveAnimation(animation_impl->id());
     EndTest();
   }
@@ -427,7 +428,7 @@
       // Any valid AnimationCurve will do here.
       scoped_ptr<AnimationCurve> curve(new FakeFloatAnimationCurve());
       scoped_ptr<Animation> animation(
-          Animation::Create(std::move(curve), 1, 1, Animation::OPACITY));
+          Animation::Create(std::move(curve), 1, 1, TargetProperty::OPACITY));
       layer->layer_animation_controller()->AddAnimation(std::move(animation));
 
       // We add the animation *before* attaching the layer to the tree.
@@ -616,7 +617,7 @@
   }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     if (TestEnded())
       return;
@@ -667,7 +668,7 @@
                 gfx::ScrollOffset(500.f, 550.f),
                 EaseInOutTimingFunction::Create()));
         scoped_ptr<Animation> animation(Animation::Create(
-            std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+            std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
         animation->set_needs_synchronized_start_time(true);
         bool animation_added =
             scroll_layer_->AddAnimation(std::move(animation));
@@ -718,8 +719,8 @@
     scoped_ptr<ScrollOffsetAnimationCurve> curve(
         ScrollOffsetAnimationCurve::Create(gfx::ScrollOffset(6500.f, 7500.f),
                                            EaseInOutTimingFunction::Create()));
-    scoped_ptr<Animation> animation(
-        Animation::Create(std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+    scoped_ptr<Animation> animation(Animation::Create(
+        std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
     animation->set_needs_synchronized_start_time(true);
     scroll_layer_->AddAnimation(std::move(animation));
   }
@@ -733,7 +734,7 @@
       case 1: {
         Animation* animation =
             scroll_layer_->layer_animation_controller()->GetAnimation(
-                Animation::SCROLL_OFFSET);
+                TargetProperty::SCROLL_OFFSET);
         scroll_layer_->layer_animation_controller()->RemoveAnimation(
             animation->id());
         scroll_layer_->SetScrollOffset(final_postion_);
@@ -762,7 +763,7 @@
         host_impl->active_tree()->root_layer()->children()[0].get();
     Animation* animation =
         scroll_layer_impl->layer_animation_controller()->GetAnimation(
-            Animation::SCROLL_OFFSET);
+            TargetProperty::SCROLL_OFFSET);
 
     if (!animation || animation->run_state() != Animation::RUNNING) {
       host_impl->BlockNotifyReadyToActivateForTesting(false);
@@ -864,7 +865,7 @@
     LayerAnimationController* root_controller_impl =
         host_impl->active_tree()->root_layer()->layer_animation_controller();
     Animation* root_animation =
-        root_controller_impl->GetAnimation(Animation::OPACITY);
+        root_controller_impl->GetAnimation(TargetProperty::OPACITY);
     if (!root_animation || root_animation->run_state() != Animation::RUNNING)
       return;
 
@@ -872,12 +873,12 @@
         host_impl->active_tree()->root_layer()->children()
             [0]->layer_animation_controller();
     Animation* child_animation =
-        child_controller_impl->GetAnimation(Animation::OPACITY);
+        child_controller_impl->GetAnimation(TargetProperty::OPACITY);
     EXPECT_EQ(Animation::RUNNING, child_animation->run_state());
     EXPECT_EQ(root_animation->start_time(), child_animation->start_time());
-    root_controller_impl->AbortAnimations(Animation::OPACITY);
-    root_controller_impl->AbortAnimations(Animation::TRANSFORM);
-    child_controller_impl->AbortAnimations(Animation::OPACITY);
+    root_controller_impl->AbortAnimations(TargetProperty::OPACITY);
+    root_controller_impl->AbortAnimations(TargetProperty::TRANSFORM);
+    child_controller_impl->AbortAnimations(TargetProperty::OPACITY);
     EndTest();
   }
 
@@ -932,7 +933,8 @@
     LayerImpl* child = root->children()[0].get();
     LayerAnimationController* controller_impl =
         child->layer_animation_controller();
-    Animation* animation = controller_impl->GetAnimation(Animation::TRANSFORM);
+    Animation* animation =
+        controller_impl->GetAnimation(TargetProperty::TRANSFORM);
 
     // The animation should be starting for the first frame.
     EXPECT_EQ(Animation::STARTING, animation->run_state());
@@ -945,7 +947,7 @@
     // And the sync tree layer should know it is animating.
     EXPECT_TRUE(child->screen_space_transform_is_animating());
 
-    controller_impl->AbortAnimations(Animation::TRANSFORM);
+    controller_impl->AbortAnimations(TargetProperty::TRANSFORM);
     EndTest();
   }
 
@@ -1046,10 +1048,10 @@
     for (auto& it : controllers_copy) {
       int id = it.first;
       if (id == host_impl->RootLayer()->id()) {
-        Animation* anim = it.second->GetAnimation(Animation::TRANSFORM);
+        Animation* anim = it.second->GetAnimation(TargetProperty::TRANSFORM);
         EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
       } else if (id == host_impl->RootLayer()->children()[0]->id()) {
-        Animation* anim = it.second->GetAnimation(Animation::OPACITY);
+        Animation* anim = it.second->GetAnimation(TargetProperty::OPACITY);
         EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
       }
       EndTest();
@@ -1086,7 +1088,8 @@
       case 2:
         LayerAnimationController* controller =
             layer_->layer_animation_controller();
-        Animation* animation = controller->GetAnimation(Animation::TRANSFORM);
+        Animation* animation =
+            controller->GetAnimation(TargetProperty::TRANSFORM);
         layer_->RemoveAnimation(animation->id());
         gfx::Transform transform;
         transform.Translate(10.f, 10.f);
@@ -1162,7 +1165,8 @@
       case 2:
         LayerAnimationController* controller =
             layer_->layer_animation_controller();
-        Animation* animation = controller->GetAnimation(Animation::TRANSFORM);
+        Animation* animation =
+            controller->GetAnimation(TargetProperty::TRANSFORM);
         layer_->RemoveAnimation(animation->id());
         break;
     }
@@ -1310,7 +1314,7 @@
   }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     called_animation_started_ = true;
     layer_tree_host()->AnimateLayers(base::TimeTicks::FromInternalValue(
@@ -1319,7 +1323,7 @@
   }
 
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
     called_animation_finished_ = true;
     EndTest();
diff --git a/cc/trees/layer_tree_host_unittest_animation_timelines.cc b/cc/trees/layer_tree_host_unittest_animation_timelines.cc
index 1c62e37..aade4bd 100644
--- a/cc/trees/layer_tree_host_unittest_animation_timelines.cc
+++ b/cc/trees/layer_tree_host_unittest_animation_timelines.cc
@@ -87,13 +87,13 @@
   }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     EXPECT_LT(base::TimeTicks(), monotonic_time);
 
     LayerAnimationController* controller =
         player_->element_animations()->layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     if (animation)
       player_->RemoveAnimation(animation->id());
 
@@ -178,7 +178,7 @@
   }
 
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
     // Animations on the impl-side controller only get deleted during a commit,
     // so we need to schedule a commit.
@@ -228,7 +228,8 @@
 
     LayerAnimationController* controller_impl =
         player_child_impl->element_animations()->layer_animation_controller();
-    Animation* animation = controller_impl->GetAnimation(Animation::OPACITY);
+    Animation* animation =
+        controller_impl->GetAnimation(TargetProperty::OPACITY);
 
     const FloatAnimationCurve* curve =
         animation->curve()->ToFloatAnimationCurve();
@@ -280,11 +281,11 @@
   }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     LayerAnimationController* controller =
         player_child_->element_animations()->layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     main_start_time_ = animation->start_time();
     controller->RemoveAnimation(animation->id());
     EndTest();
@@ -299,7 +300,7 @@
 
     LayerAnimationController* controller =
         player_child_impl->element_animations()->layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     if (!animation)
       return;
 
@@ -335,11 +336,11 @@
   }
 
   void NotifyAnimationFinished(base::TimeTicks monotonic_time,
-                               Animation::TargetProperty target_property,
+                               TargetProperty::Type target_property,
                                int group) override {
     LayerAnimationController* controller =
         player_->element_animations()->layer_animation_controller();
-    Animation* animation = controller->GetAnimation(Animation::OPACITY);
+    Animation* animation = controller->GetAnimation(TargetProperty::OPACITY);
     if (animation)
       controller->RemoveAnimation(animation->id());
     EndTest();
@@ -384,7 +385,7 @@
     LayerAnimationController* controller_impl =
         player_impl->element_animations()->layer_animation_controller();
     Animation* animation_impl =
-        controller_impl->GetAnimation(Animation::OPACITY);
+        controller_impl->GetAnimation(TargetProperty::OPACITY);
     controller_impl->RemoveAnimation(animation_impl->id());
     EndTest();
   }
@@ -427,7 +428,7 @@
       // Any valid AnimationCurve will do here.
       scoped_ptr<AnimationCurve> curve(new FakeFloatAnimationCurve());
       scoped_ptr<Animation> animation(
-          Animation::Create(std::move(curve), 1, 1, Animation::OPACITY));
+          Animation::Create(std::move(curve), 1, 1, TargetProperty::OPACITY));
       player_->AddAnimation(std::move(animation));
 
       // We add the animation *before* attaching the layer to the tree.
@@ -507,7 +508,7 @@
   }
 
   void NotifyAnimationStarted(base::TimeTicks monotonic_time,
-                              Animation::TargetProperty target_property,
+                              TargetProperty::Type target_property,
                               int group) override {
     if (TestEnded())
       return;
@@ -564,7 +565,7 @@
                 gfx::ScrollOffset(500.f, 550.f),
                 EaseInOutTimingFunction::Create()));
         scoped_ptr<Animation> animation(Animation::Create(
-            std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+            std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
         animation->set_needs_synchronized_start_time(true);
         bool impl_scrolling_supported =
             layer_tree_host()->proxy()->SupportsImplScrolling();
@@ -615,8 +616,8 @@
     scoped_ptr<ScrollOffsetAnimationCurve> curve(
         ScrollOffsetAnimationCurve::Create(gfx::ScrollOffset(6500.f, 7500.f),
                                            EaseInOutTimingFunction::Create()));
-    scoped_ptr<Animation> animation(
-        Animation::Create(std::move(curve), 1, 0, Animation::SCROLL_OFFSET));
+    scoped_ptr<Animation> animation(Animation::Create(
+        std::move(curve), 1, 0, TargetProperty::SCROLL_OFFSET));
     animation->set_needs_synchronized_start_time(true);
 
     AttachPlayersToTimeline();
@@ -631,9 +632,10 @@
       case 0:
         break;
       case 1: {
-        Animation* animation = player_child_->element_animations()
-                                   ->layer_animation_controller()
-                                   ->GetAnimation(Animation::SCROLL_OFFSET);
+        Animation* animation =
+            player_child_->element_animations()
+                ->layer_animation_controller()
+                ->GetAnimation(TargetProperty::SCROLL_OFFSET);
         player_child_->RemoveAnimation(animation->id());
         scroll_layer_->SetScrollOffset(final_postion_);
         break;
@@ -666,7 +668,7 @@
         host_impl->active_tree()->root_layer()->children()[0].get();
     Animation* animation = player_impl->element_animations()
                                ->layer_animation_controller()
-                               ->GetAnimation(Animation::SCROLL_OFFSET);
+                               ->GetAnimation(TargetProperty::SCROLL_OFFSET);
 
     if (!animation || animation->run_state() != Animation::RUNNING) {
       host_impl->BlockNotifyReadyToActivateForTesting(false);
@@ -785,19 +787,19 @@
     LayerAnimationController* root_controller_impl =
         player_impl->element_animations()->layer_animation_controller();
     Animation* root_animation =
-        root_controller_impl->GetAnimation(Animation::OPACITY);
+        root_controller_impl->GetAnimation(TargetProperty::OPACITY);
     if (!root_animation || root_animation->run_state() != Animation::RUNNING)
       return;
 
     LayerAnimationController* child_controller_impl =
         player_child_impl->element_animations()->layer_animation_controller();
     Animation* child_animation =
-        child_controller_impl->GetAnimation(Animation::OPACITY);
+        child_controller_impl->GetAnimation(TargetProperty::OPACITY);
     EXPECT_EQ(Animation::RUNNING, child_animation->run_state());
     EXPECT_EQ(root_animation->start_time(), child_animation->start_time());
-    root_controller_impl->AbortAnimations(Animation::OPACITY);
-    root_controller_impl->AbortAnimations(Animation::TRANSFORM);
-    child_controller_impl->AbortAnimations(Animation::OPACITY);
+    root_controller_impl->AbortAnimations(TargetProperty::OPACITY);
+    root_controller_impl->AbortAnimations(TargetProperty::TRANSFORM);
+    child_controller_impl->AbortAnimations(TargetProperty::OPACITY);
     EndTest();
   }
 
@@ -856,10 +858,10 @@
     for (auto& it : controllers_copy) {
       int id = it.first;
       if (id == host_impl->RootLayer()->id()) {
-        Animation* anim = it.second->GetAnimation(Animation::TRANSFORM);
+        Animation* anim = it.second->GetAnimation(TargetProperty::TRANSFORM);
         EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
       } else if (id == host_impl->RootLayer()->children()[0]->id()) {
-        Animation* anim = it.second->GetAnimation(Animation::OPACITY);
+        Animation* anim = it.second->GetAnimation(TargetProperty::OPACITY);
         EXPECT_GT((anim->start_time() - base::TimeTicks()).InSecondsF(), 0);
       }
       EndTest();
@@ -901,7 +903,8 @@
       case 2:
         LayerAnimationController* controller =
             player_child_->element_animations()->layer_animation_controller();
-        Animation* animation = controller->GetAnimation(Animation::TRANSFORM);
+        Animation* animation =
+            controller->GetAnimation(TargetProperty::TRANSFORM);
         player_child_->RemoveAnimation(animation->id());
         gfx::Transform transform;
         transform.Translate(10.f, 10.f);
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 268d01b..254f253b 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -1923,7 +1923,7 @@
 
 bool LayerTreeImpl::HasAnyAnimationTargetingProperty(
     const LayerImpl* layer,
-    Animation::TargetProperty property) const {
+    TargetProperty::Type property) const {
   return layer_tree_host_impl_->animation_host()
              ? layer_tree_host_impl_->animation_host()
                    ->HasAnyAnimationTargetingProperty(layer->id(), property)
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index bafbed1..f9f1ba1 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -412,9 +412,8 @@
   bool HasPotentiallyRunningOpacityAnimation(const LayerImpl* layer) const;
   bool HasPotentiallyRunningTransformAnimation(const LayerImpl* layer) const;
 
-  bool HasAnyAnimationTargetingProperty(
-      const LayerImpl* layer,
-      Animation::TargetProperty property) const;
+  bool HasAnyAnimationTargetingProperty(const LayerImpl* layer,
+                                        TargetProperty::Type property) const;
 
   bool FilterIsAnimatingOnImplOnly(const LayerImpl* layer) const;
   bool OpacityIsAnimatingOnImplOnly(const LayerImpl* layer) const;
diff --git a/cc/trees/property_tree_builder.cc b/cc/trees/property_tree_builder.cc
index c159aaa..551c911 100644
--- a/cc/trees/property_tree_builder.cc
+++ b/cc/trees/property_tree_builder.cc
@@ -241,7 +241,7 @@
   // in the Finished state at tree-building time on the main thread is still in
   // the Running state right after commit on the compositor thread.
   const bool has_any_transform_animation =
-      layer->HasAnyAnimationTargetingProperty(Animation::TRANSFORM);
+      layer->HasAnyAnimationTargetingProperty(TargetProperty::TRANSFORM);
 
   const bool has_surface = created_render_surface;
 
diff --git a/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp b/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
index 362c833..da39c595 100644
--- a/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
+++ b/third_party/WebKit/Source/core/animation/CompositorAnimations.cpp
@@ -678,11 +678,11 @@
         PropertySpecificKeyframeVector values;
         getKeyframeValuesForProperty(&effect, property, compositorTiming.scaledDuration, values);
 
-        CompositorAnimation::TargetProperty targetProperty;
+        CompositorTargetProperty::Type targetProperty;
         OwnPtr<CompositorAnimationCurve> curve;
         switch (property.cssProperty()) {
         case CSSPropertyOpacity: {
-            targetProperty = CompositorAnimation::TargetPropertyOpacity;
+            targetProperty = CompositorTargetProperty::OPACITY;
 
             CompositorFloatAnimationCurve* floatCurve = CompositorFactory::current().createFloatAnimationCurve();
             addKeyframesToCurve(*floatCurve, values, timing);
@@ -692,7 +692,7 @@
         }
         case CSSPropertyWebkitFilter:
         case CSSPropertyBackdropFilter: {
-            targetProperty = CompositorAnimation::TargetPropertyFilter;
+            targetProperty = CompositorTargetProperty::FILTER;
             CompositorFilterAnimationCurve* filterCurve = CompositorFactory::current().createFilterAnimationCurve();
             addKeyframesToCurve(*filterCurve, values, timing);
             setTimingFunctionOnCurve(*filterCurve, timing.timingFunction.get());
@@ -703,7 +703,7 @@
         case CSSPropertyScale:
         case CSSPropertyTranslate:
         case CSSPropertyTransform: {
-            targetProperty = CompositorAnimation::TargetPropertyTransform;
+            targetProperty = CompositorTargetProperty::TRANSFORM;
             CompositorTransformAnimationCurve* transformCurve = CompositorFactory::current().createTransformAnimationCurve();
             addKeyframesToCurve(*transformCurve, values, timing);
             setTimingFunctionOnCurve(*transformCurve, timing.timingFunction.get());
diff --git a/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp b/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
index 86e27384..1a599a7 100644
--- a/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
+++ b/third_party/WebKit/Source/core/animation/CompositorAnimationsTest.cpp
@@ -669,10 +669,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.0, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(1));
@@ -714,10 +714,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(10.0, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(1));
@@ -766,10 +766,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.0, 5.0)));
 
     // KeyframeEffect is created
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(5));
@@ -813,10 +813,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.75, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(5));
@@ -870,10 +870,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(2.0, 5.0)));
 
     // KeyframeEffect is created
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(10));
@@ -928,10 +928,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.0, 5.0)));
 
     // Create the animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(10));
@@ -976,10 +976,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.5, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(5));
@@ -1021,10 +1021,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.0, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(1));
@@ -1066,10 +1066,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.0, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(1));
@@ -1111,10 +1111,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, add(CompositorFloatKeyframe(1.0, 5.0)));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(1));
@@ -1157,10 +1157,10 @@
     usesMockCurve += EXPECT_CALL(*mockCurvePtr, setCubicBezierTimingFunction(1, 2, 3, 4));
 
     // Create animation
-    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorAnimation::TargetPropertyOpacity);
+    WebCompositorAnimationMock* mockAnimationPtr = new WebCompositorAnimationMock(CompositorTargetProperty::OPACITY);
     ExpectationSet usesMockAnimation;
 
-    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorAnimation::TargetPropertyOpacity, _, _))
+    usesMockCurve += EXPECT_CALL(*m_mockCompositorFactory, createAnimation(Ref(*mockCurvePtr), CompositorTargetProperty::OPACITY, _, _))
         .WillOnce(Return(mockAnimationPtr));
 
     usesMockAnimation += EXPECT_CALL(*mockAnimationPtr, setIterations(1));
diff --git a/third_party/WebKit/Source/core/animation/CompositorAnimationsTestHelper.h b/third_party/WebKit/Source/core/animation/CompositorAnimationsTestHelper.h
index 075bae81..0b53fa4 100644
--- a/third_party/WebKit/Source/core/animation/CompositorAnimationsTestHelper.h
+++ b/third_party/WebKit/Source/core/animation/CompositorAnimationsTestHelper.h
@@ -58,12 +58,12 @@
 
 class WebCompositorAnimationMock : public CompositorAnimation {
 private:
-    CompositorAnimation::TargetProperty m_property;
+    CompositorTargetProperty::Type m_property;
 
 public:
     // Target Property is set through the constructor.
-    WebCompositorAnimationMock(CompositorAnimation::TargetProperty p) : m_property(p) { }
-    virtual CompositorAnimation::TargetProperty targetProperty() const { return m_property; }
+    WebCompositorAnimationMock(CompositorTargetProperty::Type p) : m_property(p) { }
+    virtual CompositorTargetProperty::Type targetProperty() const { return m_property; }
 
     MOCK_METHOD0(id, int());
     MOCK_METHOD0(group, int());
@@ -130,7 +130,7 @@
 public:
     class CompositorFactoryMock : public CompositorFactory {
     public:
-        MOCK_METHOD4(createAnimation, CompositorAnimation*(const CompositorAnimationCurve& curve, CompositorAnimation::TargetProperty target, int groupId, int animationId));
+        MOCK_METHOD4(createAnimation, CompositorAnimation*(const CompositorAnimationCurve& curve, CompositorTargetProperty::Type target, int groupId, int animationId));
         MOCK_METHOD0(createFloatAnimationCurve, CompositorFloatAnimationCurve*());
         MOCK_METHOD0(createAnimationPlayer, CompositorAnimationPlayer*());
         MOCK_METHOD0(createAnimationTimeline, CompositorAnimationTimeline*());
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimation.cpp b/third_party/WebKit/Source/platform/animation/CompositorAnimation.cpp
index 6dd71a6d..2e8c2cc0 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimation.cpp
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimation.cpp
@@ -21,17 +21,7 @@
 
 namespace blink {
 
-#define STATIC_ASSERT_ENUM(a, b)                              \
-    static_assert(static_cast<int>(a) == static_cast<int>(b), \
-        "mismatching enums: " #a)
-
-// TargetProperty
-STATIC_ASSERT_ENUM(CompositorAnimation::TargetPropertyTransform, cc::Animation::TRANSFORM);
-STATIC_ASSERT_ENUM(CompositorAnimation::TargetPropertyOpacity, cc::Animation::OPACITY);
-STATIC_ASSERT_ENUM(CompositorAnimation::TargetPropertyFilter, cc::Animation::FILTER);
-STATIC_ASSERT_ENUM(CompositorAnimation::TargetPropertyScrollOffset, cc::Animation::SCROLL_OFFSET);
-
-CompositorAnimation::CompositorAnimation(const CompositorAnimationCurve& webCurve, TargetProperty targetProperty, int animationId, int groupId)
+CompositorAnimation::CompositorAnimation(const CompositorAnimationCurve& webCurve, CompositorTargetProperty::Type targetProperty, int animationId, int groupId)
 {
     if (!animationId)
         animationId = AnimationIdProvider::NextAnimationId();
@@ -62,9 +52,7 @@
         break;
     }
     }
-    m_animation = Animation::Create(
-        std::move(curve), animationId, groupId,
-        static_cast<cc::Animation::TargetProperty>(targetProperty));
+    m_animation = Animation::Create(std::move(curve), animationId, groupId, targetProperty);
 }
 
 CompositorAnimation::CompositorAnimation() {}
@@ -81,9 +69,9 @@
     return m_animation->group();
 }
 
-blink::CompositorAnimation::TargetProperty CompositorAnimation::targetProperty() const
+CompositorTargetProperty::Type CompositorAnimation::targetProperty() const
 {
-    return static_cast<CompositorAnimation::TargetProperty>(m_animation->target_property());
+    return m_animation->target_property();
 }
 
 double CompositorAnimation::iterations() const
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimation.h b/third_party/WebKit/Source/platform/animation/CompositorAnimation.h
index 80211b6..17d2a65 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimation.h
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimation.h
@@ -7,6 +7,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "platform/PlatformExport.h"
+#include "platform/animation/CompositorTargetProperty.h"
 #include "wtf/Noncopyable.h"
 
 namespace cc {
@@ -21,13 +22,6 @@
 class PLATFORM_EXPORT CompositorAnimation {
     WTF_MAKE_NONCOPYABLE(CompositorAnimation);
 public:
-    enum TargetProperty {
-        TargetPropertyTransform,
-        TargetPropertyOpacity,
-        TargetPropertyFilter,
-        TargetPropertyScrollOffset
-    };
-
     enum Direction {
         DirectionNormal,
         DirectionReverse,
@@ -42,14 +36,14 @@
         FillModeBoth
     };
 
-    CompositorAnimation(const CompositorAnimationCurve&, TargetProperty, int animationId, int groupId);
+    CompositorAnimation(const CompositorAnimationCurve&, CompositorTargetProperty::Type, int animationId, int groupId);
     virtual ~CompositorAnimation();
 
     // An id must be unique.
     virtual int id();
     virtual int group();
 
-    virtual TargetProperty targetProperty() const;
+    virtual CompositorTargetProperty::Type targetProperty() const;
 
     // This is the number of times that the animation will play. If this
     // value is zero the animation will not play. If it is negative, then
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.cpp b/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.cpp
index 21147bd..ca747797 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.cpp
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.cpp
@@ -70,7 +70,7 @@
 
 void CompositorAnimationPlayer::NotifyAnimationStarted(
     base::TimeTicks monotonicTime,
-    cc::Animation::TargetProperty targetProperty,
+    cc::TargetProperty::Type targetProperty,
     int group)
 {
     if (m_delegate)
@@ -79,7 +79,7 @@
 
 void CompositorAnimationPlayer::NotifyAnimationFinished(
     base::TimeTicks monotonicTime,
-    cc::Animation::TargetProperty targetProperty,
+    cc::TargetProperty::Type targetProperty,
     int group)
 {
     if (m_delegate)
@@ -88,7 +88,7 @@
 
 void CompositorAnimationPlayer::NotifyAnimationAborted(
     base::TimeTicks monotonicTime,
-    cc::Animation::TargetProperty targetProperty,
+    cc::TargetProperty::Type targetProperty,
     int group)
 {
     if (m_delegate)
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.h b/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.h
index 9019fe6..b58d656 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.h
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.h
@@ -45,9 +45,9 @@
 
 private:
     // cc::AnimationDelegate implementation.
-    void NotifyAnimationStarted(base::TimeTicks monotonicTime, cc::Animation::TargetProperty, int group) override;
-    void NotifyAnimationFinished(base::TimeTicks monotonicTime, cc::Animation::TargetProperty, int group) override;
-    void NotifyAnimationAborted(base::TimeTicks monotonicTime, cc::Animation::TargetProperty, int group) override;
+    void NotifyAnimationStarted(base::TimeTicks monotonicTime, cc::TargetProperty::Type, int group) override;
+    void NotifyAnimationFinished(base::TimeTicks monotonicTime, cc::TargetProperty::Type, int group) override;
+    void NotifyAnimationAborted(base::TimeTicks monotonicTime, cc::TargetProperty::Type, int group) override;
 
     scoped_refptr<cc::AnimationPlayer> m_animationPlayer;
     WebCompositorAnimationDelegate* m_delegate;
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayerTest.cpp b/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayerTest.cpp
index 792d2b7..2aa9eb0 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayerTest.cpp
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimationPlayerTest.cpp
@@ -6,6 +6,7 @@
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
+#include "platform/animation/CompositorTargetProperty.h"
 #include "public/platform/WebCompositorAnimationDelegate.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -40,10 +41,10 @@
     cc::AnimationPlayer* player = webPlayer->animationPlayer();
 
     webPlayer->setAnimationDelegate(delegate.get());
-    player->NotifyAnimationFinished(TimeTicks(), Animation::SCROLL_OFFSET, 0);
+    player->NotifyAnimationFinished(TimeTicks(), CompositorTargetProperty::SCROLL_OFFSET, 0);
 
     webPlayer->setAnimationDelegate(nullptr);
-    player->NotifyAnimationFinished(TimeTicks(), Animation::SCROLL_OFFSET, 0);
+    player->NotifyAnimationFinished(TimeTicks(), CompositorTargetProperty::SCROLL_OFFSET, 0);
 }
 
 } // namespace blink
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimationTest.cpp b/third_party/WebKit/Source/platform/animation/CompositorAnimationTest.cpp
index 4eb4b47..d68d4be 100644
--- a/third_party/WebKit/Source/platform/animation/CompositorAnimationTest.cpp
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimationTest.cpp
@@ -13,7 +13,7 @@
 {
     scoped_ptr<CompositorAnimationCurve> curve(new CompositorFloatAnimationCurve());
     scoped_ptr<CompositorAnimation> animation(new CompositorAnimation(
-        *curve, CompositorAnimation::TargetPropertyOpacity, 1, 0));
+        *curve, CompositorTargetProperty::OPACITY, 1, 0));
 
     // Ensure that the defaults are correct.
     EXPECT_EQ(1, animation->iterations());
@@ -26,7 +26,7 @@
 {
     scoped_ptr<CompositorFloatAnimationCurve> curve(new CompositorFloatAnimationCurve());
     scoped_ptr<CompositorAnimation> animation(new CompositorAnimation(
-        *curve, CompositorAnimation::TargetPropertyOpacity, 1, 0));
+        *curve, CompositorTargetProperty::OPACITY, 1, 0));
     animation->setIterations(2);
     animation->setStartTime(2);
     animation->setTimeOffset(2);
diff --git a/third_party/WebKit/Source/platform/animation/CompositorTargetProperty.h b/third_party/WebKit/Source/platform/animation/CompositorTargetProperty.h
new file mode 100644
index 0000000..9c091c9
--- /dev/null
+++ b/third_party/WebKit/Source/platform/animation/CompositorTargetProperty.h
@@ -0,0 +1,16 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CompositorTargetProperty_h
+#define CompositorTargetProperty_h
+
+#include "cc/animation/target_property.h"
+
+namespace blink {
+
+namespace CompositorTargetProperty = cc::TargetProperty;
+
+} // namespace blink
+
+#endif // CompositorTargetProperty_h
diff --git a/third_party/WebKit/Source/platform/blink_platform.gypi b/third_party/WebKit/Source/platform/blink_platform.gypi
index 35a2a63..0cb2f1a 100644
--- a/third_party/WebKit/Source/platform/blink_platform.gypi
+++ b/third_party/WebKit/Source/platform/blink_platform.gypi
@@ -150,11 +150,6 @@
       'animation/AnimationTranslationUtil.cpp',
       'animation/AnimationTranslationUtil.h',
       'animation/AnimationUtilities.h',
-      'animation/CubicBezierControlPoints.cpp',
-      'animation/CubicBezierControlPoints.h',
-      'animation/TimingFunction.cpp',
-      'animation/TimingFunction.h',
-      'animation/UnitBezier.h',
       'animation/CompositorAnimation.cpp',
       'animation/CompositorAnimation.h',
       'animation/CompositorAnimationCurve.cpp',
@@ -174,12 +169,18 @@
       'animation/CompositorFloatKeyframe.h',
       'animation/CompositorScrollOffsetAnimationCurve.cpp',
       'animation/CompositorScrollOffsetAnimationCurve.h',
+      'animation/CompositorTargetProperty.h',
       'animation/CompositorTransformAnimationCurve.cpp',
       'animation/CompositorTransformAnimationCurve.h',
       'animation/CompositorTransformKeyframe.cpp',
       'animation/CompositorTransformKeyframe.h',
       'animation/CompositorTransformOperations.cpp',
       'animation/CompositorTransformOperations.h',
+      'animation/CubicBezierControlPoints.cpp',
+      'animation/CubicBezierControlPoints.h',
+      'animation/TimingFunction.cpp',
+      'animation/TimingFunction.h',
+      'animation/UnitBezier.h',
       'audio/AudioArray.h',
       'audio/AudioBus.cpp',
       'audio/AudioBus.h',
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorFactory.cpp b/third_party/WebKit/Source/platform/graphics/CompositorFactory.cpp
index 8695aea..6ab41fd 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositorFactory.cpp
+++ b/third_party/WebKit/Source/platform/graphics/CompositorFactory.cpp
@@ -51,7 +51,7 @@
         return new CompositorFilterOperations();
     }
 
-    CompositorAnimation* createAnimation(const blink::CompositorAnimationCurve& curve, blink::CompositorAnimation::TargetProperty target, int groupId, int animationId) override
+    CompositorAnimation* createAnimation(const blink::CompositorAnimationCurve& curve, CompositorTargetProperty::Type target, int groupId, int animationId) override
     {
         return new CompositorAnimation(curve, target, animationId, groupId);
     }
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorFactory.h b/third_party/WebKit/Source/platform/graphics/CompositorFactory.h
index 143a9918..612dfda 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositorFactory.h
+++ b/third_party/WebKit/Source/platform/graphics/CompositorFactory.h
@@ -46,7 +46,7 @@
 
     virtual CompositorFilterOperations* createFilterOperations() { return nullptr; }
 
-    virtual CompositorAnimation* createAnimation(const CompositorAnimationCurve&, CompositorAnimation::TargetProperty, int groupId = 0, int animationId = 0) { return nullptr; }
+    virtual CompositorAnimation* createAnimation(const CompositorAnimationCurve&, CompositorTargetProperty::Type, int groupId = 0, int animationId = 0) { return nullptr; }
 
     virtual CompositorAnimationPlayer* createAnimationPlayer() { return nullptr; }
 
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
index d1e7faf..5a62bb9c 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
@@ -122,7 +122,7 @@
 
     OwnPtr<CompositorFloatAnimationCurve> curve = adoptPtr(CompositorFactory::current().createFloatAnimationCurve());
     curve->add(CompositorFloatKeyframe(0.0, 0.0));
-    OwnPtr<CompositorAnimation> floatAnimation(adoptPtr(CompositorFactory::current().createAnimation(*curve, CompositorAnimation::TargetPropertyOpacity)));
+    OwnPtr<CompositorAnimation> floatAnimation(adoptPtr(CompositorFactory::current().createAnimation(*curve, CompositorTargetProperty::OPACITY)));
     int animationId = floatAnimation->id();
 
     if (RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled()) {
diff --git a/third_party/WebKit/Source/platform/scroll/ProgrammaticScrollAnimator.cpp b/third_party/WebKit/Source/platform/scroll/ProgrammaticScrollAnimator.cpp
index 8f576ea..99f58fd 100644
--- a/third_party/WebKit/Source/platform/scroll/ProgrammaticScrollAnimator.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ProgrammaticScrollAnimator.cpp
@@ -124,7 +124,7 @@
         bool sentToCompositor = false;
 
         if (!m_scrollableArea->shouldScrollOnMainThread()) {
-            OwnPtr<CompositorAnimation> animation = adoptPtr(CompositorFactory::current().createAnimation(*m_animationCurve, CompositorAnimation::TargetPropertyScrollOffset));
+            OwnPtr<CompositorAnimation> animation = adoptPtr(CompositorFactory::current().createAnimation(*m_animationCurve, CompositorTargetProperty::SCROLL_OFFSET));
 
             int animationId = animation->id();
             int animationGroupId = animation->group();
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollAnimator.cpp b/third_party/WebKit/Source/platform/scroll/ScrollAnimator.cpp
index bb9b623..3425f1fd 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollAnimator.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollAnimator.cpp
@@ -265,7 +265,7 @@
             OwnPtr<CompositorAnimation> animation = adoptPtr(
                 CompositorFactory::current().createAnimation(
                     *m_animationCurve,
-                    CompositorAnimation::TargetPropertyScrollOffset));
+                    CompositorTargetProperty::SCROLL_OFFSET));
             // Being here means that either there is an animation that needs
             // to be sent to the compositor, or an animation that needs to
             // be updated (a new scroll event before the previous animation
diff --git a/third_party/WebKit/Source/web/LinkHighlightImpl.cpp b/third_party/WebKit/Source/web/LinkHighlightImpl.cpp
index 20b0fe77..4b4d726 100644
--- a/third_party/WebKit/Source/web/LinkHighlightImpl.cpp
+++ b/third_party/WebKit/Source/web/LinkHighlightImpl.cpp
@@ -305,7 +305,7 @@
     // For layout tests we don't fade out.
     curve->add(CompositorFloatKeyframe(fadeDuration + extraDurationRequired, layoutTestMode() ? startOpacity : 0));
 
-    OwnPtr<CompositorAnimation> animation = adoptPtr(CompositorFactory::current().createAnimation(*curve, CompositorAnimation::TargetPropertyOpacity));
+    OwnPtr<CompositorAnimation> animation = adoptPtr(CompositorFactory::current().createAnimation(*curve, CompositorTargetProperty::OPACITY));
 
     m_contentLayer->layer()->setDrawsContent(true);
     if (RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled())
diff --git a/ui/compositor/layer_animation_element.cc b/ui/compositor/layer_animation_element.cc
index 29aa7fa..edf5bdc8 100644
--- a/ui/compositor/layer_animation_element.cc
+++ b/ui/compositor/layer_animation_element.cc
@@ -423,9 +423,9 @@
                                        start_,
                                        target_,
                                        duration()));
-    scoped_ptr<cc::Animation> animation(
-        cc::Animation::Create(std::move(animation_curve), animation_id(),
-                              animation_group_id(), cc::Animation::OPACITY));
+    scoped_ptr<cc::Animation> animation(cc::Animation::Create(
+        std::move(animation_curve), animation_id(), animation_group_id(),
+        cc::TargetProperty::OPACITY));
     return animation;
   }
 
@@ -476,9 +476,9 @@
                                            start_,
                                            target_,
                                            duration()));
-    scoped_ptr<cc::Animation> animation(
-        cc::Animation::Create(std::move(animation_curve), animation_id(),
-                              animation_group_id(), cc::Animation::TRANSFORM));
+    scoped_ptr<cc::Animation> animation(cc::Animation::Create(
+        std::move(animation_curve), animation_id(), animation_group_id(),
+        cc::TargetProperty::TRANSFORM));
     return animation;
   }
 
@@ -548,9 +548,9 @@
   }
 
   scoped_ptr<cc::Animation> CreateCCAnimation() override {
-    scoped_ptr<cc::Animation> animation(
-        cc::Animation::Create(animation_curve_->Clone(), animation_id(),
-                              animation_group_id(), cc::Animation::TRANSFORM));
+    scoped_ptr<cc::Animation> animation(cc::Animation::Create(
+        animation_curve_->Clone(), animation_id(), animation_group_id(),
+        cc::TargetProperty::TRANSFORM));
     return animation;
   }
 
@@ -742,12 +742,11 @@
 
 // static
 LayerAnimationElement::AnimatableProperty
-LayerAnimationElement::ToAnimatableProperty(
-    cc::Animation::TargetProperty property) {
+LayerAnimationElement::ToAnimatableProperty(cc::TargetProperty::Type property) {
   switch (property) {
-    case cc::Animation::TRANSFORM:
+    case cc::TargetProperty::TRANSFORM:
       return TRANSFORM;
-    case cc::Animation::OPACITY:
+    case cc::TargetProperty::OPACITY:
       return OPACITY;
     default:
       NOTREACHED();
diff --git a/ui/compositor/layer_animation_element.h b/ui/compositor/layer_animation_element.h
index dc08f90..111f254 100644
--- a/ui/compositor/layer_animation_element.h
+++ b/ui/compositor/layer_animation_element.h
@@ -45,7 +45,7 @@
   };
 
   static AnimatableProperty ToAnimatableProperty(
-      cc::Animation::TargetProperty property);
+      cc::TargetProperty::Type property);
 
   struct COMPOSITOR_EXPORT TargetValue {
     TargetValue();
diff --git a/ui/compositor/layer_animation_sequence_unittest.cc b/ui/compositor/layer_animation_sequence_unittest.cc
index 708cc0a..0a62ddb 100644
--- a/ui/compositor/layer_animation_sequence_unittest.cc
+++ b/ui/compositor/layer_animation_sequence_unittest.cc
@@ -94,7 +94,7 @@
     effective_start = start_time + delta;
     sequence.OnThreadedAnimationStarted(cc::AnimationEvent(
         cc::AnimationEvent::STARTED, 0, sequence.animation_group_id(),
-        cc::Animation::OPACITY, effective_start));
+        cc::TargetProperty::OPACITY, effective_start));
     sequence.Progress(effective_start + delta/2, &delegate);
     EXPECT_FLOAT_EQ(middle, sequence.last_progressed_fraction());
     EXPECT_TRUE(sequence.IsFinished(effective_start + delta));
@@ -148,7 +148,7 @@
     EXPECT_EQ(starting_group_id, sequence.animation_group_id());
     sequence.OnThreadedAnimationStarted(cc::AnimationEvent(
         cc::AnimationEvent::STARTED, 0, sequence.animation_group_id(),
-        cc::Animation::OPACITY, opacity_effective_start));
+        cc::TargetProperty::OPACITY, opacity_effective_start));
     sequence.Progress(opacity_effective_start + delta/2, &delegate);
     EXPECT_FLOAT_EQ(0.5, sequence.last_progressed_fraction());
     sequence.Progress(opacity_effective_start + delta, &delegate);
@@ -176,7 +176,7 @@
     EXPECT_NE(starting_group_id, sequence.animation_group_id());
     sequence.OnThreadedAnimationStarted(cc::AnimationEvent(
         cc::AnimationEvent::STARTED, 0, sequence.animation_group_id(),
-        cc::Animation::TRANSFORM, transform_effective_start));
+        cc::TargetProperty::TRANSFORM, transform_effective_start));
     sequence.Progress(transform_effective_start + delta/2, &delegate);
     EXPECT_FLOAT_EQ(0.5, sequence.last_progressed_fraction());
     EXPECT_TRUE(sequence.IsFinished(transform_effective_start + delta));
diff --git a/ui/compositor/layer_animator_unittest.cc b/ui/compositor/layer_animator_unittest.cc
index 30f008b..f15bb4a 100644
--- a/ui/compositor/layer_animator_unittest.cc
+++ b/ui/compositor/layer_animator_unittest.cc
@@ -375,7 +375,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, effective_start));
+      cc::TargetProperty::OPACITY, effective_start));
 
   animator->Step(effective_start + delta / 2);
 
@@ -484,7 +484,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, effective_start));
+      cc::TargetProperty::OPACITY, effective_start));
 
   animator->Step(effective_start + delta / 2);
 
@@ -746,7 +746,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, effective_start));
+      cc::TargetProperty::OPACITY, effective_start));
 
   animator->Step(effective_start + delta / 2);
 
@@ -870,7 +870,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, effective_start));
+      cc::TargetProperty::OPACITY, effective_start));
 
   animator->Step(effective_start + delta / 2);
 
@@ -893,7 +893,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, second_effective_start));
+      cc::TargetProperty::OPACITY, second_effective_start));
 
   animator->Step(second_effective_start + delta / 2);
 
@@ -1193,7 +1193,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, effective_start));
+      cc::TargetProperty::OPACITY, effective_start));
 
   animator->Step(effective_start + delta / 2);
 
@@ -1221,7 +1221,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, second_effective_start));
+      cc::TargetProperty::OPACITY, second_effective_start));
 
   animator->Step(second_effective_start + delta / 2);
 
@@ -1465,7 +1465,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, effective_start));
+      cc::TargetProperty::OPACITY, effective_start));
 
   animator->Step(effective_start + delta);
   EXPECT_TRUE(test_controller.animator()->is_animating());
@@ -1476,7 +1476,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, second_effective_start));
+      cc::TargetProperty::OPACITY, second_effective_start));
 
   animator->Step(second_effective_start + delta);
 
@@ -1488,7 +1488,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, third_effective_start));
+      cc::TargetProperty::OPACITY, third_effective_start));
 
   animator->Step(third_effective_start + delta);
   EXPECT_TRUE(test_controller.animator()->is_animating());
@@ -1499,7 +1499,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, fourth_effective_start));
+      cc::TargetProperty::OPACITY, fourth_effective_start));
 
   // Skip ahead by a lot.
   animator->Step(fourth_effective_start + 1000 * delta);
@@ -1512,7 +1512,7 @@
       cc::AnimationEvent::STARTED, 0,
       test_controller.GetRunningSequence(LayerAnimationElement::OPACITY)
           ->animation_group_id(),
-      cc::Animation::OPACITY, fifth_effective_start));
+      cc::TargetProperty::OPACITY, fifth_effective_start));
 
   // Skip ahead by a lot.
   animator->Step(fifth_effective_start + 999 * delta);
diff --git a/ui/compositor/test/layer_animator_test_controller.cc b/ui/compositor/test/layer_animator_test_controller.cc
index 6ec2cf3..497cb92 100644
--- a/ui/compositor/test/layer_animator_test_controller.cc
+++ b/ui/compositor/test/layer_animator_test_controller.cc
@@ -31,9 +31,9 @@
 }
 
 void LayerAnimatorTestController::StartThreadedAnimationsIfNeeded() {
-  std::vector<cc::Animation::TargetProperty> threaded_properties;
-  threaded_properties.push_back(cc::Animation::OPACITY);
-  threaded_properties.push_back(cc::Animation::TRANSFORM);
+  std::vector<cc::TargetProperty::Type> threaded_properties;
+  threaded_properties.push_back(cc::TargetProperty::OPACITY);
+  threaded_properties.push_back(cc::TargetProperty::TRANSFORM);
 
   for (size_t i = 0; i < threaded_properties.size(); i++) {
     LayerAnimationElement::AnimatableProperty animatable_property =