cc: Heuristic for Renderer latency recovery

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 0076b4ab4c9d2b2f4218a74227fcea3347d831c9..2c6c3305aed980229314a2498136197212b46ff6 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -99,6 +99,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
 
   const SchedulerSettings& settings() const { return settings_; }
 
+  void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval);
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval);
   void SetEstimatedParentDrawTime(base::TimeDelta draw_time);
@@ -146,12 +147,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   bool PrepareTilesPending() const {
     return state_machine_.PrepareTilesPending();
   }
-  bool MainThreadIsInHighLatencyMode() const {
-    return state_machine_.MainThreadIsInHighLatencyMode();
-  }
-  bool BeginImplFrameDeadlinePending() const {
-    return !begin_impl_frame_deadline_task_.IsCancelled();
-  }
 
   base::TimeTicks AnticipatedDrawTime() const;
 
@@ -171,8 +166,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames);
   void SetVideoNeedsBeginFrames(bool video_needs_begin_frames);
 
-  void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval);
-
  protected:
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,
@@ -222,6 +215,11 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   bool inside_process_scheduled_actions_;
   SchedulerStateMachine::Action inside_action_;
 
+ protected:
+  bool BeginImplFrameDeadlinePending() const {
+    return !begin_impl_frame_deadline_task_.IsCancelled();
+  }
+
  private:
   void ScheduleBeginImplFrameDeadline();
   void ScheduleBeginImplFrameDeadlineIfNeeded();
@@ -231,6 +229,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void DrawAndSwapIfPossible();
   void ProcessScheduledActions();
   bool CanCommitAndActivateBeforeDeadline() const;
+  bool CanDrawBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
   void BeginRetroFrame();
@@ -239,6 +238,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void BeginImplFrame();
   void FinishImplFrame();
   void OnBeginImplFrameDeadline();
+
   void PollToAdvanceCommitState();
 
   base::TimeDelta EstimatedParentDrawTime() {