[GCM] Add heartbeat manager and reconnection logic due to heartbeat failure

google_apis/gcm/engine/connection_handler.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_ENGINE_CONNECTION_HANDLER_H_
 #define GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_
 
 #include "base/callback.h"
 #include "google_apis/gcm/base/gcm_export.h"
 
@@ skipping 30 matching lines @@
 
   ConnectionHandler();
   virtual ~ConnectionHandler();
 
   // Starts a new MCS connection handshake (using |login_request|) and, upon
   // success, begins listening for incoming/outgoing messages.
   //
   // Note: It is correct and expected to call Init more than once, as connection
   // issues are encountered and new connections must be made.
   virtual void Init(const mcs_proto::LoginRequest& login_request,
-                    scoped_ptr<net::StreamSocket> socket) = 0;
+                    net::StreamSocket* socket) = 0;
 
   // Checks that a handshake has been completed and a message is not already
   // in flight.
   virtual bool CanSendMessage() const = 0;
 
   // Send an MCS protobuf message. CanSendMessage() must be true.
   virtual void SendMessage(const google::protobuf::MessageLite& message) = 0;
 };
 
 }  // namespace gcm
 
 #endif  // GOOGLE_APIS_GCM_ENGINE_CONNECTION_HANDLER_H_