gfx: Add FrameTime and DisplayTime classes

cc/scheduler/frame_rate_controller.h

 // Copyright 2011 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 CC_SCHEDULER_FRAME_RATE_CONTROLLER_H_
 #define CC_SCHEDULER_FRAME_RATE_CONTROLLER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 55 matching lines @@
   void SetDeadlineAdjustment(base::TimeDelta delta);
 
  protected:
   friend class FrameRateControllerTimeSourceAdapter;
   void OnTimerTick();
 
   void PostManualTick();
   void ManualTick();
 
     // This returns null for unthrottled frame-rate.
-  base::TimeTicks NextTickTime();
+  gfx::FrameTime NextTickTime();
   // This returns now for unthrottled frame-rate.
-  base::TimeTicks LastTickTime();
+  gfx::FrameTime LastTickTime();
 
   FrameRateControllerClient* client_;
   int num_frames_pending_;
   int max_swaps_pending_;
   base::TimeDelta interval_;
   base::TimeDelta deadline_adjustment_;
   scoped_refptr<TimeSource> time_source_;
   scoped_ptr<FrameRateControllerTimeSourceAdapter> time_source_client_adapter_;
   bool active_;
 
   // Members for unthrottled frame-rate.
   bool is_time_source_throttling_;
   base::SingleThreadTaskRunner* task_runner_;
   base::WeakPtrFactory<FrameRateController> weak_factory_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FrameRateController);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_FRAME_RATE_CONTROLLER_H_