Only deliver extension messages to contexts that care.

chrome/renderer/extensions/extension_helper.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 CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 #define CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_
 #pragma once
 
 #include <map>
 
@@ skipping 48 matching lines @@
   virtual void DidCreateDataSource(WebKit::WebFrame* frame,
                                    WebKit::WebDataSource* ds);
 
   void OnExtensionResponse(int request_id, bool success,
                            const std::string& response,
                            const std::string& error);
   void OnExtensionMessageInvoke(const std::string& extension_id,
                                 const std::string& function_name,
                                 const base::ListValue& args,
                                 const GURL& event_url);
+  void OnExtensionDeliverMessage(int target_port_id,
+                                 const std::string& message);
   void OnExecuteCode(const ExtensionMsg_ExecuteCode_Params& params);
   void OnGetApplicationInfo(int page_id);
   void OnNotifyRendererViewType(ViewType::Type view_type);
   void OnUpdateBrowserWindowId(int window_id);
   void OnInlineWebstoreInstallResponse(
       int install_id, bool success, const std::string& error);
 
   // Callback triggered when we finish downloading the application definition
   // file.
   void DidDownloadApplicationDefinition(const WebKit::WebURLResponse& response,
@@ skipping 27 matching lines @@
   // Type of view attached with RenderView.
   ViewType::Type view_type_;
 
   // Id number of browser window which RenderView is attached to.
   int browser_window_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHelper);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EXTENSION_HELPER_H_