cc: Delay start of scrollbar animation setNeedsRedraw.

cc/scrollbar_animation_controller.h

Index: cc/scrollbar_animation_controller.h
diff --git a/cc/scrollbar_animation_controller.h b/cc/scrollbar_animation_controller.h
index f75e8d3e28d4b88e09db5cc70da7a7e3603130fc..e660e8f9452035c2e99b4d2f195d3d6437807419 100644
--- a/cc/scrollbar_animation_controller.h
+++ b/cc/scrollbar_animation_controller.h
@@ -17,10 +17,14 @@ class CC_EXPORT ScrollbarAnimationController {
 public:
     virtual ~ScrollbarAnimationController() {}
 
+    virtual bool isScrollGestureInProgress() const = 0;
+    virtual bool isAnimating() const = 0;
+    virtual base::TimeDelta delayBeforeStart(base::TimeTicks now) const = 0;
+
     virtual bool animate(base::TimeTicks) = 0;
-    virtual void didPinchGestureUpdate(base::TimeTicks) = 0;
-    virtual void didPinchGestureEnd(base::TimeTicks) = 0;
-    virtual void didUpdateScrollOffset(base::TimeTicks) = 0;
+    virtual void didScrollGestureBegin() = 0;
+    virtual void didScrollGestureEnd(base::TimeTicks now) = 0;
+    virtual void didProgrammaticallyUpdateScroll(base::TimeTicks now) = 0;
 };
 
 } // namespace cc