Setting Accurate ScrollResult from Blink for Elastic Scroll.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 92a0f387f119804f52f04ef666589fb1036323d1..4ae318fef4a0db666c81020fadc370333e9069ae 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -349,6 +349,7 @@ class CONTENT_EXPORT RenderWidget
   bool DoesRecordFullLayer() const;
 #endif
 
+  bool IsElasticOverscrollEnabled() const;
   bool host_closing() const { return host_closing_; }
 
  protected:
@@ -573,6 +574,7 @@ class CONTENT_EXPORT RenderWidget
   // Called by OnHandleInputEvent() to forward a mouse wheel event to the
   // compositor thread, to effect the elastic overscroll effect.
   void ObserveWheelEventAndResult(const blink::WebMouseWheelEvent& wheel_event,
+                                  const gfx::Vector2dF& wheel_unused_delta,
                                   bool event_processed);
 
   // Check whether the WebWidget has any touch event handlers registered