[GCM] Stop/restart GCM when the state is forced off/on

google_apis/gcm/gcm_client.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 GOOGLE_APIS_GCM_GCM_CLIENT_H_
 #define GOOGLE_APIS_GCM_GCM_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 135 matching lines @@
       const checkin_proto::ChromeBuildProto& chrome_build_proto,
       const base::FilePath& store_path,
       const std::vector<std::string>& account_ids,
       const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner,
       const scoped_refptr<net::URLRequestContextGetter>&
           url_request_context_getter,
       Delegate* delegate) = 0;
 
   // Loads the data from the persistent store. This will automatically kick off
   // the check-in if the check-in info is not found in the store.
+  // TODO(jianli): consider renaming this name to Start.
   virtual void Load() = 0;
 
+  // Stops using the GCM service. This will not erase the persisted data.
+  virtual void Stop() = 0;
+
   // Checks out of the GCM service. This will erase all the cached and persisted
   // data.
   virtual void CheckOut() = 0;
 
   // Registers the application for GCM. Delegate::OnRegisterFinished will be
   // called asynchronously upon completion.
   // |app_id|: application ID.
   // |cert|: SHA-1 of public key of the application, in base16 format.
   // |sender_ids|: list of IDs of the servers that are allowed to send the
   //               messages to the application. These IDs are assigned by the
@@ skipping 14 matching lines @@
   // |receiver_id|: registration ID of the receiver party.
   // |message|: message to be sent.
   virtual void Send(const std::string& app_id,
                     const std::string& receiver_id,
                     const OutgoingMessage& message) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_GCM_CLIENT_H_