Move extension messages to their own file and add a RenderViewObserver to start moving the extens...

content/browser/webui/web_ui.h

 // Copyright (c) 2011 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_BROWSER_WEBUI_WEB_UI_H_
 #define CONTENT_BROWSER_WEBUI_WEB_UI_H_
 #pragma once
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/string16.h"
 #include "content/common/page_transition_types.h"
 
 class DictionaryValue;
 class WebUIMessageHandler;
 class GURL;
 class ListValue;
 class Profile;
 class RenderViewHost;
 class TabContents;
 class Value;
-struct ViewHostMsg_DomMessage_Params;
+struct ExtensionHostMsg_DomMessage_Params;
 
 // A WebUI sets up the datasources and message handlers for a given HTML-based
 // UI. It is contained by a WebUIManager.
 class WebUI {
  public:
   explicit WebUI(TabContents* contents);
   virtual ~WebUI();
 
   // Called by RenderViewHost when the RenderView is first created. This is
   // *not* called for every page load because in some cases
@@ skipping 10 matching lines @@
   // DOM messages instead of the previous WebUI instance.
   //
   // If a WebUI instance has code that is usually triggered from a JavaScript
   // onload handler, this should be overridden to check to see if the web page's
   // DOM is still intact (e.g., due to a back/forward navigation that remains
   // within the same page), and if so trigger that code manually since onload
   // won't be run in that case.
   virtual void DidBecomeActiveForReusedRenderView() {}
 
   // Called from TabContents.
-  virtual void ProcessWebUIMessage(const ViewHostMsg_DomMessage_Params& params);
+  virtual void ProcessWebUIMessage(
+      const ExtensionHostMsg_DomMessage_Params& params);
 
   // Used by WebUIMessageHandlers.
   typedef Callback1<const ListValue*>::Type MessageCallback;
   void RegisterMessageCallback(const std::string& message,
                                MessageCallback* callback);
 
   // Returns true if the favicon should be hidden for the current tab.
   bool hide_favicon() const {
     return hide_favicon_;
   }
@@ skipping 140 matching lines @@
   // Extract a string value from a list Value.
   string16 ExtractStringValue(const ListValue* value);
 
   WebUI* web_ui_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebUIMessageHandler);
 };
 
 #endif  // CONTENT_BROWSER_WEBUI_WEB_UI_H_