Schedule bitmap animation timers on the compositor task runner.

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

Index: third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h b/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
index 78c55b1e26e90eb7f39e005f11c6bef4c2e6abd7..d6387a194a0384815a04846c0e2f0774310724c1 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 #include "core/CoreExport.h"
+#include "platform/WebTaskRunner.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/IntSizeHash.h"
 #include "platform/geometry/LayoutSize.h"
@@ -47,10 +48,13 @@ class CORE_EXPORT ImageResourceContent final
 
  public:
   static ImageResourceContent* Create(
+      RefPtr<WebTaskRunner> task_runner,
       PassRefPtr<blink::Image> image = nullptr) {
-    return new ImageResourceContent(std::move(image));
+    return new ImageResourceContent(task_runner, std::move(image));
   }
-  static ImageResourceContent* Fetch(FetchParameters&, ResourceFetcher*);
+  static ImageResourceContent* Fetch(RefPtr<WebTaskRunner>,
+                                     FetchParameters&,
+                                     ResourceFetcher*);
 
   // Returns the nullImage() if the image is not available yet.
   blink::Image* GetImage();
@@ -161,7 +165,8 @@ class CORE_EXPORT ImageResourceContent final
   }
 
  private:
-  explicit ImageResourceContent(PassRefPtr<blink::Image> = nullptr);
+  explicit ImageResourceContent(RefPtr<WebTaskRunner>,
+                                PassRefPtr<blink::Image> = nullptr);
 
   // ImageObserver
   void DecodedSizeChangedTo(const blink::Image*, size_t new_size) override;
@@ -203,6 +208,8 @@ class CORE_EXPORT ImageResourceContent final
 #if DCHECK_IS_ON()
   bool is_update_image_being_called_ = false;
 #endif
+
+  RefPtr<WebTaskRunner> task_runner_;
 };
 
 }  // namespace blink