Change the platform app manifest structure.

chrome/common/extensions/extension.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 CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #pragma once
 
 #include <algorithm>
 #include <map>
@@ skipping 735 matching lines @@
   bool LoadCommands(string16* error);
   bool LoadPlugins(string16* error);
   bool LoadNaClModules(string16* error);
   bool LoadWebAccessibleResources(string16* error);
   bool LoadSandboxedPages(string16* error);
   bool CheckRequirements(string16* error);
   bool LoadDefaultLocale(string16* error);
   bool LoadOfflineEnabled(string16* error);
   bool LoadOptionsPage(string16* error);
   bool LoadBackgroundScripts(string16* error);
+  bool LoadBackgroundScripts(const std::string& key, string16* error);
   bool LoadBackgroundPage(const ExtensionAPIPermissionSet& api_permissions,
                           string16* error);
+  bool LoadBackgroundPage(const std::string& key,
+                          const ExtensionAPIPermissionSet& api_permissions,
+                          string16* error);
   bool LoadBackgroundPersistent(
       const ExtensionAPIPermissionSet& api_permissions,
       string16* error);
   bool LoadBackgroundAllowJSAccess(
       const ExtensionAPIPermissionSet& api_permissions,
       string16* error);
   // Parses a single action in the manifest.
   bool LoadWebIntentAction(const std::string& action_name,
                            const base::DictionaryValue& intent_service,
                            string16* error);
@@ skipping 364 matching lines @@
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const ExtensionPermissionSet* permissions,
       Reason reason);
 };
 
 } // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_