[SYNC] Refactor SyncSourceInfo and add support in chrome invalidation client ...

chrome/browser/sync/notifier/server_notifier_thread.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.
 //
 // This class is the (hackish) way to use the XMPP parts of
 // MediatorThread for server-issued notifications.
 //
 // TODO(akalin): Decomp MediatorThread into an XMPP service part and a
 // notifications-specific part and use the XMPP service part for
 // server-issued notifications.
@@ skipping 41 matching lines @@
   virtual void SubscribeForUpdates(
       const std::vector<std::string>& subscribed_services_list);
 
   // Overridden to stop listening to server notifications.
   virtual void Logout();
 
   // Must not be called.
   virtual void SendNotification(const OutgoingNotificationData& data);
 
   // ChromeInvalidationClient::Listener implementation.
-  virtual void OnInvalidate(syncable::ModelType model_type);
+  // We pass on two pieces of information to observers through the
+  // IncomingNotificationData.
+  // - the model type being invalidated, through IncomingNotificationData's
+  //       service_url.
+  // - the invalidation payload for that model type, through
+  //       IncomingNotificationData's service_specific_data.
+  virtual void OnInvalidate(syncable::ModelType model_type,
+                            const std::string& payload);
   virtual void OnInvalidateAll();
 
   // StateWriter implementation.
   virtual void WriteState(const std::string& state);
 
  private:
   // Posted to the worker thread by ListenForUpdates().
   void DoListenForUpdates();
 
   // Posted to the worker thread by SubscribeForUpdates().
   void RegisterTypesAndSignalSubscribed();
 
   // Posted to the worker thread by Logout().
   void StopInvalidationListener();
 
   std::string state_;
   // Hack to get the nice thread-safe behavior for |state_writer_|.
   scoped_refptr<ObserverListThreadSafe<StateWriter> > state_writers_;
   // We still need to keep |state_writer_| around to remove it from
   // |state_writers_|.
   StateWriter* state_writer_;
   scoped_ptr<ChromeInvalidationClient> chrome_invalidation_client_;
 };
 
 }  // namespace sync_notifier
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(sync_notifier::ServerNotifierThread);
 
 #endif  // CHROME_BROWSER_SYNC_NOTIFIER_SERVER_NOTIFIER_THREAD_H_