gfx: Add FrameTime and DisplayTime classes

cc/animation/scrollbar_animation_controller.h

 // Copyright 2012 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_H_
 #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_
 
 #include "base/time/time.h"
 #include "cc/base/cc_export.h"
 #include "ui/gfx/vector2d_f.h"
+#include "ui/gfx/frame_time.h"
 
 namespace cc {
 
 // This abstract class represents the compositor-side analogy of
 // ScrollbarAnimator.  Individual platforms should subclass it to provide
 // specialized implementation.
 class CC_EXPORT ScrollbarAnimationController {
  public:
   virtual ~ScrollbarAnimationController() {}
 
   virtual bool IsAnimating() const = 0;
-  virtual base::TimeDelta DelayBeforeStart(base::TimeTicks now) const = 0;
+  virtual base::TimeDelta DelayBeforeStart(gfx::FrameTime now)
+      const = 0;
 
-  virtual bool Animate(base::TimeTicks now) = 0;
+  virtual bool Animate(gfx::FrameTime now) = 0;
   virtual void DidScrollGestureBegin() = 0;
-  virtual void DidScrollGestureEnd(base::TimeTicks now) = 0;
-  virtual void DidMouseMoveOffScrollbar(base::TimeTicks now) = 0;
+  virtual void DidScrollGestureEnd(gfx::FrameTime now) = 0;
+  virtual void DidMouseMoveOffScrollbar(gfx::FrameTime now) = 0;
 
   // Returns true if we should start an animation.
-  virtual bool DidScrollUpdate(base::TimeTicks now) = 0;
-  virtual bool DidMouseMoveNear(base::TimeTicks now, float distance) = 0;
+  virtual bool DidScrollUpdate(gfx::FrameTime now) = 0;
+  virtual bool DidMouseMoveNear(gfx::FrameTime now, float distance)
+      = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_H_