Restoring behavior where PeerConnection tracks changes to MediaStreams.

talk/libjingle.gyp

 #
 # libjingle
 # Copyright 2012 Google Inc.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 #  1. Redistributions of source code must retain the above copyright notice,
 #     this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 724 matching lines @@
         'app/webrtc/jsepsessiondescription.h',
         'app/webrtc/localaudiosource.cc',
         'app/webrtc/localaudiosource.h',
         'app/webrtc/mediaconstraintsinterface.cc',
         'app/webrtc/mediaconstraintsinterface.h',
         'app/webrtc/mediacontroller.cc',
         'app/webrtc/mediacontroller.h',
         'app/webrtc/mediastream.cc',
         'app/webrtc/mediastream.h',
         'app/webrtc/mediastreaminterface.h',
+        'app/webrtc/mediastreamobserver.cc',
+        'app/webrtc/mediastreamobserver.h',
         'app/webrtc/mediastreamprovider.h',
         'app/webrtc/mediastreamproxy.h',
         'app/webrtc/mediastreamtrack.h',
         'app/webrtc/mediastreamtrackproxy.h',
         'app/webrtc/notifier.h',
         'app/webrtc/peerconnection.cc',
         'app/webrtc/peerconnection.h',
         'app/webrtc/peerconnectionfactory.cc',
         'app/webrtc/peerconnectionfactory.h',
         'app/webrtc/peerconnectionfactoryproxy.h',
@@ skipping 38 matching lines @@
         ['OS=="android" and build_with_chromium==0', {
           'sources': [
             'app/webrtc/androidvideocapturer.h',
             'app/webrtc/androidvideocapturer.cc',
            ],
         }],
       ],
     },  # target libjingle_peerconnection
   ],
 }