diff --git a/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator.mm b/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator.mm
index 019941a..3b53bb46 100644
--- a/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator.mm
+++ b/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator.mm
@@ -154,7 +154,8 @@
   _alertCoordinator = nil;
 }
 
-- (void)showStoreKitWithProductIdentifier:(NSString*)productIdentifer {
+- (void)showStoreKitWithProductIdentifier:(NSString*)productIdentifer
+                            campaignToken:(NSString*)campaignToken {
   if (_storeKitCoordinator) {
     [_storeKitCoordinator stop];
     _storeKitCoordinator = nil;
@@ -164,8 +165,10 @@
       initWithBaseViewController:self.baseViewController
                          browser:self.browser];
   _storeKitCoordinator.delegate = self;
-  _storeKitCoordinator.iTunesProductParameters =
-      @{SKStoreProductParameterITunesItemIdentifier : productIdentifer};
+  _storeKitCoordinator.iTunesProductParameters = @{
+    SKStoreProductParameterITunesItemIdentifier : productIdentifer,
+    SKStoreProductParameterCampaignToken : campaignToken
+  };
   [_storeKitCoordinator start];
 }
 
diff --git a/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator_unittest.mm b/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator_unittest.mm
index cbf25d4..9a30d88 100644
--- a/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator_unittest.mm
+++ b/ios/chrome/browser/ui/save_to_photos/save_to_photos_coordinator_unittest.mm
@@ -250,6 +250,7 @@
       [coordinator conformsToProtocol:@protocol(SaveToPhotosMediatorDelegate)]);
 
   NSString* productIdentifier = @"product_identifier";
+  NSString* campaignToken = @"campaign_token";
 
   id mock_store_kit_coordinator = OCMClassMock([StoreKitCoordinator class]);
   OCMExpect([mock_store_kit_coordinator alloc])
@@ -260,14 +261,18 @@
       .andReturn(mock_store_kit_coordinator);
   OCMExpect([mock_store_kit_coordinator
       setDelegate:static_cast<id<SaveToPhotosMediatorDelegate>>(coordinator)]);
-  OCMExpect([mock_store_kit_coordinator setITunesProductParameters:@{
-    SKStoreProductParameterITunesItemIdentifier : productIdentifier
-  }]);
+  NSDictionary* expectedITunesProductParameters = @{
+    SKStoreProductParameterITunesItemIdentifier : productIdentifier,
+    SKStoreProductParameterCampaignToken : campaignToken
+  };
+  OCMExpect([mock_store_kit_coordinator
+      setITunesProductParameters:expectedITunesProductParameters]);
   OCMExpect([base::apple::ObjCCast<StoreKitCoordinator>(
       mock_store_kit_coordinator) start]);
 
   [static_cast<id<SaveToPhotosMediatorDelegate>>(coordinator)
-      showStoreKitWithProductIdentifier:productIdentifier];
+      showStoreKitWithProductIdentifier:productIdentifier
+                          campaignToken:campaignToken];
   EXPECT_OCMOCK_VERIFY(mock_store_kit_coordinator);
 
   OCMExpect([base::apple::ObjCCast<StoreKitCoordinator>(
diff --git a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.h b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.h
index 400c9d5..ce54712 100644
--- a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.h
+++ b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.h
@@ -24,6 +24,19 @@
 class WebState;
 }  // namespace web
 
+// Photos app product identifier passed to the StoreKit view.
+extern NSString* const kGooglePhotosAppProductIdentifier;
+
+// This campaign token is passed to the StoreKit view so the number of Photos
+// app installs from Chrome can be measured. This should not be modified.
+extern NSString* const kGooglePhotosStoreKitCampaignToken;
+
+// Photos app URL template to open the "Recently added" view.
+extern NSString* const kGooglePhotosRecentlyAddedURLString;
+
+// Photos app URL scheme to check if the Photos app is installed.
+extern NSString* const kGooglePhotosAppURLScheme;
+
 // Save to Photos mediator. This UI is presented when the user has selected an
 // image to be saved in their Photos library e.g. Google Photos. It lets the
 // user select an account as destination and notifies the user of progress and
diff --git a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.mm b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.mm
index ba8a6619..afdd0db 100644
--- a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.mm
+++ b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator.mm
@@ -27,13 +27,6 @@
 
 namespace {
 
-NSString* const kGooglePhotosAppProductIdentifier = @"962194608";
-
-NSString* const kGooglePhotosRecentlyAddedURLString =
-    @"https://photos.google.com/search/_tra_?obfsgid=";
-
-NSString* const kGooglePhotosAppURLScheme = @"googlephotos";
-
 NSURL* GetGooglePhotosAppURL() {
   NSURLComponents* photosAppURLComponents = [[NSURLComponents alloc] init];
   photosAppURLComponents.scheme = kGooglePhotosAppURLScheme;
@@ -59,6 +52,15 @@
 
 }  // namespace
 
+NSString* const kGooglePhotosAppProductIdentifier = @"962194608";
+
+NSString* const kGooglePhotosStoreKitCampaignToken = @"chrome-x-photos";
+
+NSString* const kGooglePhotosRecentlyAddedURLString =
+    @"https://photos.google.com/search/_tra_?obfsgid=";
+
+NSString* const kGooglePhotosAppURLScheme = @"googlephotos";
+
 @implementation SaveToPhotosMediator {
   PhotosService* _photosService;
   PrefService* _prefService;
@@ -406,7 +408,8 @@
   // If the Photos app is not installed, show StoreKit.
   if (![UIApplication.sharedApplication canOpenURL:GetGooglePhotosAppURL()]) {
     [self.delegate
-        showStoreKitWithProductIdentifier:kGooglePhotosAppProductIdentifier];
+        showStoreKitWithProductIdentifier:kGooglePhotosAppProductIdentifier
+                            campaignToken:kGooglePhotosStoreKitCampaignToken];
     return;
   }
 
diff --git a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_delegate.h b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_delegate.h
index 72b476ad..c0e28517 100644
--- a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_delegate.h
+++ b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_delegate.h
@@ -33,7 +33,8 @@
 - (void)hideTryAgainOrCancelAlert;
 
 // Show and hide StoreKit.
-- (void)showStoreKitWithProductIdentifier:(NSString*)productIdentifer;
+- (void)showStoreKitWithProductIdentifier:(NSString*)productIdentifer
+                            campaignToken:(NSString*)campaignToken;
 - (void)hideStoreKit;
 
 // Show a snackbar with the given `message`, a button with label `buttonText`.
diff --git a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_unittest.mm b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_unittest.mm
index 6badb884..394a5cc 100644
--- a/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_unittest.mm
+++ b/ios/chrome/browser/ui/save_to_photos/save_to_photos_mediator_unittest.mm
@@ -39,8 +39,6 @@
 
 namespace {
 
-NSString* const kGooglePhotosAppProductIdentifier = @"962194608";
-
 // Fake image URL.
 const char kFakeImageUrl[] = "http://example.com/image.png";
 
@@ -63,13 +61,6 @@
   return base::SysUTF8ToNSString(GURL(kFakeImageUrl).ExtractFileName());
 }
 
-// URL to open the Google Photos app.
-NSString* const kGooglePhotosRecentlyAddedURLString =
-    @"https://photos.google.com/search/_tra_?obfsgid=";
-
-// URL Scheme to test whether the Google Photos app is installed.
-NSString* const kGooglePhotosAppURLScheme = @"googlephotos";
-
 // Returns the URL to test whether the Google Photos app is installed.
 NSURL* GetGooglePhotosAppURL() {
   NSURLComponents* photosAppURLComponents = [[NSURLComponents alloc] init];
@@ -543,7 +534,8 @@
   // Expect that the mediator tries to show StoreKit with the expected product
   // identifier.
   OCMExpect([mock_save_to_photos_mediator_delegate
-      showStoreKitWithProductIdentifier:kGooglePhotosAppProductIdentifier]);
+      showStoreKitWithProductIdentifier:kGooglePhotosAppProductIdentifier
+                          campaignToken:kGooglePhotosStoreKitCampaignToken]);
 
   // Simulate the user tapped the "Open" button.
   savedMessageAction();