cc: Make visible rect computation aware of pixel-moving filters

This adds a new ClipNode type (EXPANDS_CLIP) and uses such nodes to
account for the fact that certain kinds of effects have output that
depends on pixels that later get clipped out.

BUG=653631
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Committed: https://crrev.com/5e48a2e0284b930c68e73f44ea15807a9ffab541
Cr-Original-Commit-Position: refs/heads/master@{#429050}
Review-Url: https://codereview.chromium.org/2423483003
Cr-Commit-Position: refs/heads/master@{#442652}

• cc/BUILD.gn[diff]
• cc/layers/render_surface_impl.cc[diff]
• cc/layers/render_surface_impl.h[diff]
• cc/trees/clip_expander.cc[Added - diff]
• cc/trees/clip_expander.h[Added - diff]
• cc/trees/clip_node.cc[diff]
• cc/trees/clip_node.h[diff]
• cc/trees/draw_property_utils.cc[diff]
• cc/trees/layer_tree_host_common_unittest.cc[diff]
• cc/trees/property_tree_builder.cc[diff]
• third_party/WebKit/LayoutTests/css3/filters/blur-filter-page-scroll-expected.png[diff]
• third_party/WebKit/LayoutTests/platform/android/css3/filters/blur-filter-page-scroll-expected.png[Renamed from third_party/WebKit/LayoutTests/platform/mac/css3/filters/blur-filter-page-scroll-expected.png - diff]
• third_party/WebKit/LayoutTests/platform/win/css3/filters/blur-filter-page-scroll-expected.png[Deleted - diff]