[GCM] Wiring heartbeat interval calls to GCMDriver

components/gcm_driver/gcm_client.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 COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 #define COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 302 matching lines @@
   // Adds the Instance ID data for a specific app to the persistent store.
   virtual void AddInstanceIDData(const std::string& app_id,
                                  const std::string& instance_id_data) = 0;
 
   // Removes the Instance ID data for a specific app from the persistent store.
   virtual void RemoveInstanceIDData(const std::string& app_id) = 0;
 
   // Retrieves the Instance ID data for a specific app from the persistent
   // store.
   virtual std::string GetInstanceIDData(const std::string& app_id) = 0;
+
+  // Gets and sets custom heartbeat interval for the MCS connection.
+  // |scope| is used to identify the component that requests a custom interval
+  // to be set, and allows that component to later revoke the setting. It should
+  // be unique.
+  virtual void AddHeartbeatInterval(const std::string& scope,
+                                    int interval_ms) = 0;
+  virtual void RemoveHeartbeatInterval(const std::string& scope) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_CLIENT_H_