Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/platform/graphics/BitmapImage.h

Index: third_party/WebKit/Source/platform/graphics/BitmapImage.h
diff --git a/third_party/WebKit/Source/platform/graphics/BitmapImage.h b/third_party/WebKit/Source/platform/graphics/BitmapImage.h
index 4ee77dc5dd1ca98b323682b8e4b623957b784bda..90bd353aa33c67e88e204ca2571cfc64de8287fb 100644
--- a/third_party/WebKit/Source/platform/graphics/BitmapImage.h
+++ b/third_party/WebKit/Source/platform/graphics/BitmapImage.h
@@ -192,7 +192,7 @@ class PLATFORM_EXPORT BitmapImage final : public Image {
       cached_frame_;  // A cached copy of the most recently-accessed frame.
   size_t cached_frame_index_;  // Index of the frame that is cached.
 
-  std::unique_ptr<Timer<BitmapImage>> frame_timer_;
+  std::unique_ptr<TaskRunnerTimer<BitmapImage>> frame_timer_;
   int repetition_count_;  // How many total animation loops we should do.  This
                           // will be cAnimationNone if this image type is
                           // incapable of animation.
@@ -215,6 +215,8 @@ class PLATFORM_EXPORT BitmapImage final : public Image {
   bool size_available_ : 1;     // Whether we can obtain the size of the first
                                 // image frame from ImageIO yet.
   mutable bool have_frame_count_ : 1;
+
+  RefPtr<WebTaskRunner> task_runner_;
 };
 
 DEFINE_IMAGE_TYPE_CASTS(BitmapImage);