Some touch-event forwarding optimization.

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 514 matching lines @@
   virtual void didAdoptURLLoader(WebKit::WebURLLoader* loader);
   virtual void didExhaustMemoryAvailableForScript(WebKit::WebFrame* frame);
   virtual void didCreateScriptContext(WebKit::WebFrame* frame,
                                       v8::Handle<v8::Context>,
                                       int world_id);
   virtual void willReleaseScriptContext(WebKit::WebFrame* frame,
                                         v8::Handle<v8::Context>,
                                         int world_id);
   virtual void didChangeScrollOffset(WebKit::WebFrame* frame);
   virtual void numberOfWheelEventHandlersChanged(unsigned num_handlers);
+  virtual void numberOfTouchEventHandlersChanged(unsigned num_handlers);
   virtual void didChangeContentsSize(WebKit::WebFrame* frame,
                                      const WebKit::WebSize& size);
   virtual void reportFindInPageMatchCount(int request_id,
                                           int count,
                                           bool final_update);
   virtual void reportFindInPageSelection(int request_id,
                                          int active_match_ordinal,
                                          const WebKit::WebRect& sel);
 
   virtual void openFileSystem(WebKit::WebFrame* frame,
@@ skipping 732 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_