gfx: Add FrameTime and DisplayTime classes

cc/animation/scrollbar_animation_controller.h

Index: cc/animation/scrollbar_animation_controller.h
diff --git a/cc/animation/scrollbar_animation_controller.h b/cc/animation/scrollbar_animation_controller.h
index ecef4fb2d9728cec7789c4336524a7d76f0a731c..7cb86b34d56ef3cc728e16c981548629383ec583 100644
--- a/cc/animation/scrollbar_animation_controller.h
+++ b/cc/animation/scrollbar_animation_controller.h
@@ -8,6 +8,7 @@
 #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 {
 
@@ -19,16 +20,18 @@ class CC_EXPORT ScrollbarAnimationController {
   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