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 5d58a876efd8cf56759129979bd98a67c0d4e845..0321f54c94d22b507fc70344decab275a3cf1a42 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -348,6 +348,10 @@ class CONTENT_EXPORT RenderWidget
   bool DoesRecordFullLayer() const;
 #endif
 
+#if defined(OS_MACOSX) && !defined(OS_IOS)
+  bool IsElasticOverscrollEnabled() const;
+#endif
+
   bool host_closing() const { return host_closing_; }
 
  protected:
@@ -818,6 +822,7 @@ class CONTENT_EXPORT RenderWidget
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
+  gfx::Vector2dF unused_delta_on_wheel_overscroll_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };