Adding files to libjingle .gn/.gyp.

third_party/libjingle/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 
 # From third_party/libjingle/libjingle.gyp's target_defaults.
 config("jingle_unexported_configs") {
   defines = [
     "EXPAT_RELATIVE_PATH",
@@ skipping 303 matching lines @@
       "source/talk/app/webrtc/localaudiosource.h",
       "source/talk/app/webrtc/mediaconstraintsinterface.cc",
       "source/talk/app/webrtc/mediaconstraintsinterface.h",
       "source/talk/app/webrtc/mediacontroller.cc",
       "source/talk/app/webrtc/mediacontroller.h",
       "source/talk/app/webrtc/mediastream.cc",
       "source/talk/app/webrtc/mediastream.h",
       "source/talk/app/webrtc/mediastreamhandler.cc",
       "source/talk/app/webrtc/mediastreamhandler.h",
       "source/talk/app/webrtc/mediastreaminterface.h",
+      "source/talk/app/webrtc/mediastreamobserver.cc",
+      "source/talk/app/webrtc/mediastreamobserver.h",
       "source/talk/app/webrtc/mediastreamprovider.h",
       "source/talk/app/webrtc/mediastreamproxy.h",
       "source/talk/app/webrtc/mediastreamtrack.h",
       "source/talk/app/webrtc/mediastreamtrackproxy.h",
       "source/talk/app/webrtc/notifier.h",
       "source/talk/app/webrtc/peerconnection.cc",
       "source/talk/app/webrtc/peerconnection.h",
       "source/talk/app/webrtc/peerconnectionfactory.cc",
       "source/talk/app/webrtc/peerconnectionfactory.h",
       "source/talk/app/webrtc/peerconnectioninterface.h",
@@ skipping 159 matching lines @@
       "$p2p_dir/stunprober/stunprober.cc",
     ]
 
     deps = [
       ":libjingle_webrtc_common",
       "//third_party/webrtc/base:rtc_base",
     ]
   }
 }  # enable_webrtc
 # TODO(GYP): Port libjingle.gyp's enable_webrtc condition block.