gfx: Add FrameTime and DisplayTime classes

ui/gfx/animation/animation.h

Index: ui/gfx/animation/animation.h
diff --git a/ui/gfx/animation/animation.h b/ui/gfx/animation/animation.h
index 32d297e2939b3c2e7455b0f89ed9938ceab371e2..2ab8192fafb10470a6170c8aa4dd0a25b4294a49 100644
--- a/ui/gfx/animation/animation.h
+++ b/ui/gfx/animation/animation.h
@@ -77,12 +77,12 @@ class GFX_EXPORT Animation : public AnimationContainerElement {
   virtual bool ShouldSendCanceledFromStop();
 
   AnimationContainer* container() { return container_.get(); }
-  base::TimeTicks start_time() const { return start_time_; }
+  gfx::FrameTime start_time() const { return start_time_; }
   AnimationDelegate* delegate() { return delegate_; }
 
   // AnimationContainer::Element overrides
-  virtual void SetStartTime(base::TimeTicks start_time) OVERRIDE;
-  virtual void Step(base::TimeTicks time_now) = 0;
+  virtual void SetStartTime(gfx::FrameTime start_time) OVERRIDE;
+  virtual void Step(gfx::FrameTime time_now) = 0;
   virtual base::TimeDelta GetTimerInterval() const OVERRIDE;
 
  private:
@@ -99,7 +99,7 @@ class GFX_EXPORT Animation : public AnimationContainerElement {
   scoped_refptr<AnimationContainer> container_;
 
   // Time we started at.
-  base::TimeTicks start_time_;
+  gfx::FrameTime start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(Animation);
 };