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

google_apis/gcm/engine/gcm_store.h

 // Copyright 2014 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_ENGINE_GCM_STORE_H_
 #define GOOGLE_APIS_GCM_ENGINE_GCM_STORE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 50 matching lines @@
   typedef base::Callback<void(scoped_ptr<LoadResult> result)> LoadCallback;
   typedef base::Callback<void(bool success)> UpdateCallback;
 
   GCMStore();
   virtual ~GCMStore();
 
   // Load the data from persistent store and pass the initial state back to
   // caller.
   virtual void Load(const LoadCallback& callback) = 0;
 
+  // Close the persistent store.
+  virtual void Close() = 0;
+
   // Clears the GCM store of all data.
   virtual void Destroy(const UpdateCallback& callback) = 0;
 
   // Sets this device's messaging credentials.
   virtual void SetDeviceCredentials(uint64 device_android_id,
                                     uint64 device_security_token,
                                     const UpdateCallback& callback) = 0;
 
   // Unacknowledged incoming message handling.
   virtual void AddIncomingMessage(const std::string& persistent_id,
@@ skipping 27 matching lines @@
   virtual void RemoveUserSerialNumber(const std::string& username,
                                       const UpdateCallback& callback) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GCMStore);
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_ENGINE_GCM_STORE_H_