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

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 14733f788a71b77fbd401d0014efde433a36832f..99e2bd0dac1f48dc028f8a90ac91bd51767f5fe6 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -194,6 +194,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   // SetNeedsAnimate().
   void SetNeedsRedrawOnImplThread() override;
   void SetNeedsRedrawRectOnImplThread(const gfx::Rect& dirty_rect) override;
+  void OutputSurfaceDidRequestDraw() override;
   void SetNeedsAnimateOnImplThread() override;
   void SetNeedsPrepareTilesOnImplThread() override;
   void SetNeedsCommitOnImplThread() override;
@@ -218,6 +219,7 @@ class CC_EXPORT ThreadProxy : 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;