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

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 27dbee368dcb5bc9c7476b9ca89b7a19cea0e9ce..2c5ea85fb36f99d29057644cfc31dd68e61fcf4a 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -43,6 +43,7 @@ class SchedulerClient {
   virtual void ScheduledActionActivateSyncTree() = 0;
   virtual void ScheduledActionBeginOutputSurfaceCreation() = 0;
   virtual void ScheduledActionPrepareTiles() = 0;
+  virtual void ScheduledActionInvalidateOutputSurface() = 0;
   virtual void DidAnticipatedDrawTimeChange(base::TimeTicks time) = 0;
   virtual base::TimeDelta DrawDurationEstimate() = 0;
   virtual base::TimeDelta BeginMainFrameToCommitDurationEstimate() = 0;
@@ -117,6 +118,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
 
   void SetNeedsRedraw();
 
+  void OutputSurfaceDidRequestDraw();
+
   void SetNeedsAnimate();
 
   void SetNeedsPrepareTiles();
@@ -212,10 +215,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
   base::Closure begin_unthrottled_frame_closure_;
 
   base::Closure begin_impl_frame_deadline_closure_;
-  base::Closure poll_for_draw_triggers_closure_;
   base::Closure advance_commit_state_closure_;
   base::CancelableClosure begin_impl_frame_deadline_task_;
-  base::CancelableClosure poll_for_draw_triggers_task_;
   base::CancelableClosure advance_commit_state_task_;
 
   SchedulerStateMachine state_machine_;
@@ -224,7 +225,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
 
  private:
   void ScheduleBeginImplFrameDeadline();
-  void RescheduleBeginImplFrameDeadlineIfNeeded();
+  void ScheduleBeginImplFrameDeadlineIfNeeded();
   void SetupNextBeginFrameIfNeeded();
   void PostBeginRetroFrameIfNeeded();
   void SetupPollingMechanisms(bool needs_begin_frame);
@@ -236,7 +237,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
   void BeginRetroFrame();
   void BeginImplFrame(const BeginFrameArgs& args);
   void OnBeginImplFrameDeadline();
-  void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
   void SetupPowerMonitoring();
   void TeardownPowerMonitoring();