Add DisplayScheduler for Surfaces

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 0076b4ab4c9d2b2f4218a74227fcea3347d831c9..ec712011d6c0295d08c8b7c0c3195cf6e7aedb08 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);
@@ -171,8 +172,6 @@ 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,
@@ -231,6 +230,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void DrawAndSwapIfPossible();
   void ProcessScheduledActions();
   bool CanCommitAndActivateBeforeDeadline() const;
+  bool CanDrawBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;
   void BeginRetroFrame();