Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/core/loader/resource/ImageResource.h

Index: third_party/WebKit/Source/core/loader/resource/ImageResource.h
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResource.h b/third_party/WebKit/Source/core/loader/resource/ImageResource.h
index 2df41d23683fa6eb12cb25a2e1511b2a832049a0..d09ac015f7b2a801a8ed40965121cd62edd42379 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResource.h
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResource.h
@@ -58,12 +58,14 @@ class CORE_EXPORT ImageResource final
  public:
   using ClientType = ResourceClient;
 
-  // Use ImageResourceContent::fetch() unless ImageResource is required.
-  // TODO(hiroshige): Make fetch() private.
-  static ImageResource* Fetch(FetchParameters&, ResourceFetcher*);
+  // Use ImageResourceContent::Fetch() unless ImageResource is required.
+  // TODO(hiroshige): Make Fetch() private.
+  static ImageResource* Fetch(RefPtr<WebTaskRunner>,
+                              FetchParameters&,
+                              ResourceFetcher*);
 
-  // TODO(hiroshige): Make create() test-only by refactoring ImageDocument.
-  static ImageResource* Create(const ResourceRequest&);
+  // TODO(hiroshige): Make Create() test-only by refactoring ImageDocument.
+  static ImageResource* Create(RefPtr<WebTaskRunner>, const ResourceRequest&);
 
   ~ImageResource() override;
 
@@ -111,7 +113,8 @@ class CORE_EXPORT ImageResource final
   class ImageResourceInfoImpl;
   class ImageResourceFactory;
 
-  ImageResource(const ResourceRequest&,
+  ImageResource(RefPtr<WebTaskRunner>,
+                const ResourceRequest&,
                 const ResourceLoaderOptions&,
                 ImageResourceContent*,
                 bool is_placeholder);
@@ -170,6 +173,7 @@ class CORE_EXPORT ImageResource final
 
   Timer<ImageResource> flush_timer_;
   double last_flush_time_ = 0.;
+  RefPtr<WebTaskRunner> task_runner_;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Image);