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 82f305a298411b272b55b6fa3df42a26c0a3917f..7a046acac0000bdfd950e8506baac71cf1bca591 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;
@@ -215,11 +216,9 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
 
   base::Closure begin_retro_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_retro_frame_task_;
   base::CancelableClosure begin_impl_frame_deadline_task_;
-  base::CancelableClosure poll_for_draw_triggers_task_;
   base::CancelableClosure advance_commit_state_task_;
 
   SchedulerStateMachine state_machine_;
@@ -228,7 +227,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
 
  private:
   void ScheduleBeginImplFrameDeadline();
-  void RescheduleBeginImplFrameDeadlineIfNeeded();
+  void ScheduleBeginImplFrameDeadlineIfNeeded();
   void SetupNextBeginFrameIfNeeded();
   void PostBeginRetroFrameIfNeeded();
   void SetupPollingMechanisms();
@@ -240,7 +239,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
   void BeginRetroFrame();
   void BeginImplFrame(const BeginFrameArgs& args);
   void OnBeginImplFrameDeadline();
-  void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
   void SetupPowerMonitoring();
   void TeardownPowerMonitoring();