Android: Decouple animate from vsync

ui/base/android/window_android_observer.h

Index: ui/base/android/window_android_observer.h
diff --git a/ui/base/android/window_android_observer.h b/ui/base/android/window_android_observer.h
index 0d0062c9a77b0ec50e6428004343c6ac5b1882bb..959ff8c564e65d865cc08710f83b890b71cb0a9f 100644
--- a/ui/base/android/window_android_observer.h
+++ b/ui/base/android/window_android_observer.h
@@ -17,6 +17,7 @@ class UI_BASE_EXPORT WindowAndroidObserver {
   virtual void OnWillDestroyWindow() = 0;
   virtual void OnVSync(base::TimeTicks frame_time,
                        base::TimeDelta vsync_period) = 0;
+  virtual void OnAnimate(base::TimeTicks frame_begin_time) {}

[Ted C, 2014/05/27 21:33:19]

do you ever want to make this pure virtual?  Just wondering if you want a TODO
to make sure you do that after the downstream roll.

 
  protected:
   virtual ~WindowAndroidObserver() {}