Revert of 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 4b039dee337cb15b52ef39a3b5f5286c3ba5edad..3a4af5a1930227cde95a5f2347609e0b44df481d 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -41,12 +41,10 @@
   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;
   virtual base::TimeDelta CommitToActivateDurationEstimate() = 0;
-  // TODO(sunnyps): Rename DidBeginImplFrameDeadline to DidFinishImplFrame.
   virtual void DidBeginImplFrameDeadline() = 0;
   virtual void SendBeginFramesToChildren(const BeginFrameArgs& args) = 0;
   virtual void SendBeginMainFrameNotExpectedSoon() = 0;
@@ -97,8 +95,6 @@
   // BeginFrameObserverMixin
   bool OnBeginFrameMixInDelegate(const BeginFrameArgs& args) override;
 
-  void OnDrawForOutputSurface();
-
   const SchedulerSettings& settings() const { return settings_; }
 
   void CommitVSyncParameters(base::TimeTicks timebase,
@@ -214,9 +210,11 @@
 
   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_;
@@ -225,7 +223,7 @@
 
  private:
   void ScheduleBeginImplFrameDeadline();
-  void ScheduleBeginImplFrameDeadlineIfNeeded();
+  void RescheduleBeginImplFrameDeadlineIfNeeded();
   void SetupNextBeginFrameIfNeeded();
   void PostBeginRetroFrameIfNeeded();
   void SetupPollingMechanisms();
@@ -235,11 +233,9 @@
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
   void BeginRetroFrame();
-  void BeginImplFrameWithDeadline(const BeginFrameArgs& args);
-  void BeginImplFrameSynchronous(const BeginFrameArgs& args);
   void BeginImplFrame(const BeginFrameArgs& args);
-  void FinishImplFrame();
   void OnBeginImplFrameDeadline();
+  void PollForAnticipatedDrawTriggers();
   void PollToAdvanceCommitState();
   void UpdateActiveFrameSource();