gfx: Add FrameTime and DisplayTime classes

cc/animation/scrollbar_animation_controller_thinning.h

 // Copyright 2013 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_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
 #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/cc_export.h"
@@ skipping 14 matching lines @@
       base::TimeDelta animation_duration);
 
   virtual ~ScrollbarAnimationControllerThinning();
 
   void set_mouse_move_distance_for_test(float distance) {
     mouse_move_distance_to_trigger_animation_ = distance;
   }
 
   // ScrollbarAnimationController overrides.
   virtual bool IsAnimating() const OVERRIDE;
-  virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const OVERRIDE;
+  virtual base::TimeDelta DelayBeforeStart(gfx::FrameTime now) const
+      OVERRIDE;
 
-  virtual bool Animate(base::TimeTicks now) OVERRIDE;
+  virtual bool Animate(gfx::FrameTime now) OVERRIDE;
   virtual void DidScrollGestureBegin() OVERRIDE;
-  virtual void DidScrollGestureEnd(base::TimeTicks now) OVERRIDE;
-  virtual void DidMouseMoveOffScrollbar(base::TimeTicks now) OVERRIDE;
-  virtual bool DidScrollUpdate(base::TimeTicks now) OVERRIDE;
-  virtual bool DidMouseMoveNear(base::TimeTicks now, float distance) OVERRIDE;
+  virtual void DidScrollGestureEnd(gfx::FrameTime now) OVERRIDE;
+  virtual void DidMouseMoveOffScrollbar(gfx::FrameTime now) OVERRIDE;
+  virtual bool DidScrollUpdate(gfx::FrameTime now) OVERRIDE;
+  virtual bool DidMouseMoveNear(gfx::FrameTime now, float distance)
+      OVERRIDE;
 
  protected:
   ScrollbarAnimationControllerThinning(LayerImpl* scroll_layer,
                                        base::TimeDelta animation_delay,
                                        base::TimeDelta animation_duration);
 
  private:
   // Returns how far through the animation we are as a progress value from
   // 0 to 1.
-  float AnimationProgressAtTime(base::TimeTicks now);
+  float AnimationProgressAtTime(gfx::FrameTime now);
   float OpacityAtAnimationProgress(float progress);
   float ThumbThicknessScaleAtAnimationProgress(float progress);
   void ApplyOpacityAndThumbThicknessScale(float opacity,
                                           float thumb_thickness_scale);
 
   LayerImpl* scroll_layer_;
 
-  base::TimeTicks last_awaken_time_;
+  gfx::FrameTime last_awaken_time_;
   bool scroll_gesture_in_progress_;
   bool mouse_is_over_scrollbar_;
 
   base::TimeDelta animation_delay_;
   base::TimeDelta animation_duration_;
   float mouse_move_distance_to_trigger_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerThinning);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_