cc: Make scheduling be driven by vsync for android webview.

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index cfc746a64a9f048c7f69f844255a4cb5527fbd54..8fcaa2681331ff2be99ab8e4e760ada32cae224d 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -73,6 +73,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   void ScheduledActionActivateSyncTree() override;
   void ScheduledActionBeginOutputSurfaceCreation() override;
   void ScheduledActionPrepareTiles() override;
+  void ScheduledActionInvalidateOutputSurface() override;
   void DidAnticipatedDrawTimeChange(base::TimeTicks time) override;
   base::TimeDelta DrawDurationEstimate() override;
   base::TimeDelta BeginMainFrameToCommitDurationEstimate() override;
@@ -109,6 +110,8 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   void DidActivateSyncTree() override;
   void DidPrepareTiles() override;
   void DidCompletePageScaleAnimationOnImplThread() override;
+  void OnDrawForOutputSurface() override;
+
   void SetDebugState(const LayerTreeDebugState& debug_state) override {}
 
   void RequestNewOutputSurface();