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 3a4af5a1930227cde95a5f2347609e0b44df481d..bcfb9bb2bf7103b9c21c3b9a75264ee9862e1aa3 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -97,6 +97,7 @@ 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);
@@ -166,8 +167,6 @@ 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,