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 542438b34f1c7836ba2eda1c000ff3c908d75af6..e092fc0884ec52f091e5d1dba5d8e97c81f35d49 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);
@@ -170,8 +171,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
 
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames);
 
-  void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval);
-
  protected:
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,