gfx: Add FrameTime and DisplayTime classes

ui/compositor/layer_animator.h

Index: ui/compositor/layer_animator.h
diff --git a/ui/compositor/layer_animator.h b/ui/compositor/layer_animator.h
index 5fe0d5c189617d8434fee88cb7e20c0bf8cec99a..edf38119a3b0971fe1e2265ac1e9d1aa9d2107b2 100644
--- a/ui/compositor/layer_animator.h
+++ b/ui/compositor/layer_animator.h
@@ -180,10 +180,10 @@ class COMPOSITOR_EXPORT LayerAnimator
     disable_timer_for_test_ = disable_timer;
   }
 
-  void set_last_step_time(base::TimeTicks time) {
+  void set_last_step_time(gfx::FrameTime time) {
     last_step_time_ = time;
   }
-  base::TimeTicks last_step_time() const { return last_step_time_; }
+  gfx::FrameTime last_step_time() const { return last_step_time_; }
 
  protected:
   virtual ~LayerAnimator();
@@ -193,7 +193,7 @@ class COMPOSITOR_EXPORT LayerAnimator
 
   // Virtual for testing.
   virtual void ProgressAnimation(LayerAnimationSequence* sequence,
-                                 base::TimeTicks now);
+                                 gfx::FrameTime now);
 
   void ProgressAnimationToEnd(LayerAnimationSequence* sequence);
 
@@ -223,8 +223,8 @@ class COMPOSITOR_EXPORT LayerAnimator
   typedef std::deque<linked_ptr<LayerAnimationSequence> > AnimationQueue;
 
   // Implementation of AnimationContainerElement
-  virtual void SetStartTime(base::TimeTicks start_time) OVERRIDE;
-  virtual void Step(base::TimeTicks time_now) OVERRIDE;
+  virtual void SetStartTime(gfx::FrameTime start_time) OVERRIDE;
+  virtual void Step(gfx::FrameTime time_now) OVERRIDE;
   virtual base::TimeDelta GetTimerInterval() const OVERRIDE;
 
   // Finishes all animations by either advancing them to their final state or by
@@ -324,7 +324,7 @@ class COMPOSITOR_EXPORT LayerAnimator
   gfx::Tween::Type tween_type_;
 
   // Used for coordinating the starting of animations.
-  base::TimeTicks last_step_time_;
+  gfx::FrameTime last_step_time_;
 
   // True if we are being stepped by our container.
   bool is_started_;