Revert of Early terminate flings when scrolling impossible

cc/input/input_handler.h

Index: cc/input/input_handler.h
diff --git a/cc/input/input_handler.h b/cc/input/input_handler.h
index b26934548b9454e1252a80a30f0af39252f6b5f3..fda17cdeee35f6fb8560104a42f2556a94b21b13 100644
--- a/cc/input/input_handler.h
+++ b/cc/input/input_handler.h
@@ -24,6 +24,12 @@
 
 class LayerScrollOffsetDelegate;
 
+struct DidOverscrollParams {
+  gfx::Vector2dF accumulated_overscroll;
+  gfx::Vector2dF latest_overscroll_delta;
+  gfx::Vector2dF current_fling_velocity;
+};
+
 class CC_EXPORT InputHandlerClient {
  public:
   virtual ~InputHandlerClient() {}
@@ -35,8 +41,7 @@
   // Called when scroll deltas reaching the root scrolling layer go unused.
   // The accumulated overscroll is scoped by the most recent call to
   // InputHandler::ScrollBegin.
-  virtual void DidOverscroll(const gfx::Vector2dF& accumulated_overscroll,
-                             const gfx::Vector2dF& latest_overscroll_delta) = 0;
+  virtual void DidOverscroll(const DidOverscrollParams& params) = 0;
 
  protected:
   InputHandlerClient() {}
@@ -89,6 +94,8 @@
   // ScrollIgnored if not.
   virtual ScrollStatus FlingScrollBegin() = 0;
 
+  virtual void NotifyCurrentFlingVelocity(const gfx::Vector2dF& velocity) = 0;
+
   virtual void MouseMoveAt(const gfx::Point& mouse_position) = 0;
 
   // Stop scrolling the selected layer. Should only be called if ScrollBegin()