Setting Accurate ScrollResult from Blink for Elastic Scroll.

content/renderer/render_widget.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 331 matching lines @@
   // changed. If they are changed, the new value will be sent to the browser
   // process. This method does nothing when the browser process is not able to
   // handle composition range and composition character bounds.
   void UpdateCompositionInfo(bool should_update_range);
 
 #if defined(OS_ANDROID)
   void DidChangeBodyBackgroundColor(SkColor bg_color);
   bool DoesRecordFullLayer() const;
 #endif
 
+  bool IsElasticOverscrollEnabled() const;
   bool host_closing() const { return host_closing_; }
 
  protected:
   // Friend RefCounted so that the dtor can be non-public. Using this class
   // without ref-counting is an error.
   friend class base::RefCounted<RenderWidget>;
   // For unit tests.
   friend class RenderWidgetTest;
 
   enum ResizeAck {
@@ skipping 204 matching lines @@
 
   // Called by OnHandleInputEvent() to notify subclasses that a gesture event is
   // about to be handled.
   // Returns true if no further handling is needed. In that case, the event
   // won't be sent to WebKit.
   virtual bool WillHandleGestureEvent(const blink::WebGestureEvent& event);
 
   // 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
   // at the given point.
   virtual bool HasTouchEventHandlersAt(const gfx::Point& point) const;
 
   // Check whether the WebWidget has any touch event handlers registered.
   virtual void hasTouchEventHandlers(bool has_handlers);
 
   // Tell the browser about the actions permitted for a new touch point.
@@ skipping 239 matching lines @@
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_