Add ZoomLevelChanged and DidChangeScrollOffset to RenderViewObserver

content/renderer/render_view_impl.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_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 662 matching lines @@
       const gfx::Rect& paint_bounds,
       TransportDIB** dib,
       gfx::Rect* location,
       gfx::Rect* clip) OVERRIDE;
   virtual gfx::Point GetScrollOffset() OVERRIDE;
   virtual void DidHandleKeyEvent() OVERRIDE;
   virtual bool WillHandleMouseEvent(
       const WebKit::WebMouseEvent& event) OVERRIDE;
   virtual void DidHandleMouseEvent(const WebKit::WebMouseEvent& event) OVERRIDE;
   virtual void DidHandleTouchEvent(const WebKit::WebTouchEvent& event) OVERRIDE;
+  virtual void DidHandleWheelEvent(
+      const WebKit::WebMouseWheelEvent& event) OVERRIDE;
   virtual void OnSetFocus(bool enable) OVERRIDE;
   virtual void OnWasHidden() OVERRIDE;
   virtual void OnWasRestored(bool needs_repainting) OVERRIDE;
   virtual bool SupportsAsynchronousSwapBuffers() OVERRIDE;
   virtual void OnImeSetComposition(
       const string16& text,
       const std::vector<WebKit::WebCompositionUnderline>& underlines,
       int selection_start,
       int selection_end) OVERRIDE;
   virtual void OnImeConfirmComposition(
@@ skipping 638 matching lines @@
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.  You can
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_