Added class to subscribe to GCD notifications over XMPP.

remoting/remoting_srcs.gypi

 # 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.
 
 {
   'variables': {
     'daemon_controller_guid': '655bd819-c08c-4b04-80c2-f160739ff6ef',
     'rdp_desktop_session_guid': '6a7699f0-ee43-43e7-aa30-a6738f9bd470',
     'remoting_base_sources': [
       'base/auto_thread.cc',
@@ skipping 183 matching lines @@
       'protocol/v2_authenticator.h',
       'protocol/video_stub.h',
       'signaling/iq_sender.cc',
       'signaling/iq_sender.h',
       'signaling/jid_util.cc',
       'signaling/jid_util.h',
       'signaling/jingle_info_request.cc',
       'signaling/jingle_info_request.h',
       'signaling/log_to_server.cc',
       'signaling/log_to_server.h',
+      'signaling/push_notification_subscriber.cc',
+      'signaling/push_notification_subscriber.h',
       'signaling/server_log_entry.cc',
       'signaling/server_log_entry.h',
       'signaling/signal_strategy.h',
       'signaling/xmpp_signal_strategy.cc',
       'signaling/xmpp_signal_strategy.h',
       'signaling/xmpp_stream_parser.cc',
       'signaling/xmpp_stream_parser.h',
       'signaling/xmpp_login_handler.cc',
       'signaling/xmpp_login_handler.h',
     ],
@@ skipping 61 matching lines @@
       'client/plugin/pepper_video_renderer.h',
       'client/plugin/pepper_video_renderer_2d.cc',
       'client/plugin/pepper_video_renderer_2d.h',
       'client/plugin/pepper_video_renderer_3d.cc',
       'client/plugin/pepper_video_renderer_3d.h',
       'client/plugin/touch_input_scaler.cc',
       'client/plugin/touch_input_scaler.h',
     ],
   }
 }