Add DisplayScheduler for Surfaces

components/surfaces/surfaces_scheduler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SURFACES_SURFACES_SCHEDULER_H_
 #define COMPONENTS_SURFACES_SURFACES_SCHEDULER_H_
 
 #include <set>
 
 #include "cc/scheduler/scheduler.h"
 
 namespace cc {
 class Display;
 }
 
 namespace surfaces {
 
+// TODO(brianderson): Reconcile with DisplayScheduler crbug.com/476676
 class SurfacesScheduler : public cc::SchedulerClient {
  public:
   SurfacesScheduler();
   ~SurfacesScheduler() override;
 
   void SetNeedsDraw();
 
   void OnVSyncParametersUpdated(base::TimeTicks timebase,
                                 base::TimeDelta interval);
 
@@ skipping 22 matching lines @@
   std::set<cc::Display*> displays_;
   scoped_ptr<cc::Scheduler> scheduler_;
   base::TimeDelta draw_estimate_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfacesScheduler);
 };
 
 }  // namespace mojo
 
 #endif  // COMPONENTS_SURFACES_SURFACES_SCHEDULER_H_