Add js api for hosted/pacakged apps to request notification authorization

chrome/renderer/extensions/chrome_app_bindings.h

 // Copyright (c) 2010 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.
 
 // The AppObjectExtension is a v8 extension that creates an object
 // at window.chrome.app.  This object allows javascript to get details
 // on the app state of the page.
 // The read-only property app.isInstalled is true if the current page is
 // within the extent of an installed, enabled app.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_CHROME_APP_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_CHROME_APP_BINDINGS_H_
 #pragma once
 
+#include <string>
+
 class ExtensionDispatcher;
 
 namespace v8 {
 class Extension;
 }
 
 namespace extensions_v8 {
 
 class ChromeAppExtension {
  public:
   static v8::Extension* Get(ExtensionDispatcher* extension_dispatcher);
+  static void HandleGetAppNotifyChannelResponse(
+      int request_id, const std::string& channel_id, const std::string& error);
 };
 
 }  // namespace extensions_v8
 
 #endif  // CHROME_RENDERER_EXTENSIONS_CHROME_APP_BINDINGS_H_