[extension SW]: Support event listener registration and event dispatching.

extensions/renderer/extension_frame_helper.h

 // Copyright 2013 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 EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_
 #define EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
@@ skipping 39 matching lines @@
   // Returns the main frame of the extension's background page, or null if there
   // isn't one in this process.
   static content::RenderFrame* GetBackgroundPageFrame(
       const std::string& extension_id);
 
   // Returns true if the given |context| is for any frame in the extension's
   // event page.
   // TODO(devlin): This isn't really used properly, and should probably be
   // deleted.
   static bool IsContextForEventPage(const ScriptContext* context);
+  // Returns true if the given |context| is for an extension service worker.
+  static bool IsContextForSW(const ScriptContext& context);
 
   ViewType view_type() const { return view_type_; }
   int tab_id() const { return tab_id_; }
   int browser_window_id() const { return browser_window_id_; }
   bool did_create_current_document_element() const {
     return did_create_current_document_element_;
   }
 
   // Called when the document element has been inserted in this frame. This
   // method may invoke untrusted JavaScript code that invalidate the frame and
@@ skipping 84 matching lines @@
   bool delayed_main_world_script_initialization_ = false;
 
   base::WeakPtrFactory<ExtensionFrameHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionFrameHelper);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_EXTENSION_FRAME_HELPER_H_