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 d3f41a5733e89d1b6be99c7d03c53afc786b0a7d..ce7ea0d2c9a9f7a35f2bba6e188ac4fdfea561c5 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -71,6 +71,7 @@ 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;
@@ -92,6 +93,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   void NotifyReadyToDraw() override;
   void SetNeedsRedrawOnImplThread() override;
   void SetNeedsRedrawRectOnImplThread(const gfx::Rect& dirty_rect) override;
+  void OutputSurfaceDidRequestDraw() override;
   void SetNeedsAnimateOnImplThread() override;
   void SetNeedsPrepareTilesOnImplThread() override;
   void SetNeedsCommitOnImplThread() override;