Add onChange event to preference extension APIs.

chrome/browser/extensions/extension_service.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_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 19 matching lines @@
 #include "chrome/browser/extensions/pending_extension_info.h"
 #include "chrome/browser/extensions/sandboxed_extension_unpacker.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/property_bag.h"
 #include "content/browser/browser_thread.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
 
 class ExtensionBrowserEventRouter;
+class ExtensionPreferenceEventRouter;
 class ExtensionServiceBackend;
 class ExtensionToolbarModel;
 class ExtensionUpdater;
 class GURL;
 class Profile;
 class Version;
 
 // This is an interface class to encapsulate the dependencies that
 // ExtensionUpdater has on ExtensionService. This allows easy mocking.
 class ExtensionUpdateService {
@@ skipping 504 matching lines @@
 
   // Manages the installation of default apps and the promotion of them in the
   // app launcher.
   DefaultApps default_apps_;
 
   // Flag to make sure event routers are only initialized once.
   bool event_routers_initialized_;
 
   scoped_ptr<ExtensionBrowserEventRouter> browser_event_router_;
 
+  scoped_ptr<ExtensionPreferenceEventRouter> preference_event_router_;
+
   // A collection of external extension providers.  Each provider reads
   // a source of external extension information.  Examples include the
   // windows registry and external_extensions.json.
   ProviderCollection external_extension_providers_;
 
   // Set to true by OnExternalExtensionUpdateUrlFound() when an external
   // extension URL is found.  Used in CheckForExternalUpdates() to see
   // if an update check is needed to install pending extensions.
   bool external_extension_url_added_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            UpdatePendingExtensionAlreadyInstalled);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_