[GCM] Add app handler support for connection events

components/gcm_driver/gcm_driver.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_DRIVER_H_
 #define COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 68 matching lines @@
 
   // For testing purpose. Always NULL on Android.
   virtual GCMClient* GetGCMClientForTesting() const = 0;
 
   // Returns true if the service was started.
   virtual bool IsStarted() const = 0;
 
   // Returns true if the gcm client is ready.
   virtual bool IsGCMClientReady() const = 0;
 
+  // Returns true if the gcm client has an open and active connection.
+  virtual bool IsConnected() const = 0;
+
   // Get GCM client internal states and statistics.
   // If clear_logs is true then activity logs will be cleared before the stats
   // are returned.
   virtual void GetGCMStatistics(const GetGCMStatisticsCallback& callback,
                                 bool clear_logs) = 0;
 
   // Enables/disables GCM activity recording, and then returns the stats.
   virtual void SetGCMRecording(const GetGCMStatisticsCallback& callback,
                                bool recording) = 0;
 
@@ skipping 57 matching lines @@
 
   // The default handler when no app handler can be found in the map.
   DefaultGCMAppHandler default_app_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(GCMDriver);
 };
 
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_DRIVER_H_