Add ZoomLevelChanged and DidChangeScrollOffset to RenderViewObserver

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_
 #pragma once
 
 #include <deque>
 #include <vector>
@@ skipping 22 matching lines @@
 
 struct ViewHostMsg_UpdateRect_Params;
 class ViewHostMsg_UpdateRect;
 
 namespace IPC {
 class SyncMessage;
 }
 
 namespace WebKit {
 class WebMouseEvent;
+class WebMouseWheelEvent;
 class WebTouchEvent;
 class WebWidget;
 }
 
 namespace gfx {
 class Point;
 }
 
 namespace skia {
 class PlatformCanvas;
@@ skipping 296 matching lines @@
   virtual bool WillHandleMouseEvent(const WebKit::WebMouseEvent& event);
 
   // Called by OnHandleInputEvent() to notify subclasses that a mouse event was
   // just handled.
   virtual void DidHandleMouseEvent(const WebKit::WebMouseEvent& event) {}
 
   // Called by OnHandleInputEvent() to notify subclasses that a touch event was
   // just handled.
   virtual void DidHandleTouchEvent(const WebKit::WebTouchEvent& event) {}
 
+  // Called by OnHandleInputEvent() to notify subclasses that a wheel event was
+  // just handled.
+  virtual void DidHandleWheelEvent(const WebKit::WebMouseWheelEvent& event) {}
+
   // Should return true if the underlying WebWidget is responsible for
   // the scheduling of compositing requests.
   virtual bool WebWidgetHandlesCompositorScheduling() const;
 
   // Routing ID that allows us to communicate to the parent browser process
   // RenderWidgetHost. When MSG_ROUTING_NONE, no messages may be sent.
   int32 routing_id_;
 
   int32 surface_id_;
 
@@ skipping 149 matching lines @@
   // Set to true if we should invert all pixels.
   bool invert_;
 
   // The Skia paint object for inverting.
   scoped_ptr<SkPaint> invert_paint_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_