gfx: Add FrameTime and DisplayTime classes

ui/gfx/animation/animation_container_element.h

 // Copyright (c) 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 UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
 #define UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_
 
 #include "base/time/time.h"
 #include "ui/gfx/gfx_export.h"
+#include "ui/gfx/frame_time.h"
 
 namespace gfx {
 
 // Interface for the elements the AnimationContainer contains. This is
 // implemented by Animation.
 class GFX_EXPORT AnimationContainerElement {
  public:
   // Sets the start of the animation. This is invoked from
   // AnimationContainer::Start.
-  virtual void SetStartTime(base::TimeTicks start_time) = 0;
+  virtual void SetStartTime(gfx::FrameTime start_time) = 0;
 
   // Invoked when the animation is to progress.
-  virtual void Step(base::TimeTicks time_now) = 0;
+  virtual void Step(gfx::FrameTime time_now) = 0;
 
   // Returns the time interval of the animation. If an Element needs to change
   // this it should first invoke Stop, then Start.
   virtual base::TimeDelta GetTimerInterval() const = 0;
 
  protected:
   virtual ~AnimationContainerElement() {}
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_ANIMATION_ANIMATION_CONTAINER_ELEMENT_H_