This CL adds methods to manipulate RTP header extension, particularly

third_party/libjingle/libjingle.gyp

 # Copyright (c) 2012 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.
 
 {
   'includes': [
     '../../build/win_precompile.gypi',
   ],
   'variables': {
     'enabled_libjingle_device_manager%': 0,
     'libjingle_additional_deps%': [],
     'libjingle_peerconnection_additional_deps%': [],
     'libjingle_source%': "source",
     'libpeer_target_type%': 'static_library',
     'libpeer_allocator_shim%': 0,
   },
   'target_defaults': {
     'defines': [
       'EXPAT_RELATIVE_PATH',
       'FEATURE_ENABLE_SSL',
       'GTEST_RELATIVE_PATH',
       'HAVE_SRTP',
       'HAVE_WEBRTC_VIDEO',
       'HAVE_WEBRTC_VOICE',
       'LOGGING_INSIDE_LIBJINGLE',
       'NO_MAIN_THREAD_WRAPPING',
       'NO_SOUND_SYSTEM',
       'SRTP_RELATIVE_PATH',
       'USE_WEBRTC_DEV_BRANCH',
+      'ENABLE_EXTERNAL_AUTH',
     ],
     'configurations': {
       'Debug': {
         'defines': [
           # TODO(sergeyu): Fix libjingle to use NDEBUG instead of
           # _DEBUG and remove this define. See below as well.
           '_DEBUG',
         ],
       }
     },
@@ skipping 388 matching lines @@
             '<(libjingle_source)/talk/session/media/audiomonitor.cc',
             '<(libjingle_source)/talk/session/media/audiomonitor.h',
             '<(libjingle_source)/talk/session/media/call.cc',
             '<(libjingle_source)/talk/session/media/call.h',
             '<(libjingle_source)/talk/session/media/channel.cc',
             '<(libjingle_source)/talk/session/media/channel.h',
             '<(libjingle_source)/talk/session/media/channelmanager.cc',
             '<(libjingle_source)/talk/session/media/channelmanager.h',
             '<(libjingle_source)/talk/session/media/currentspeakermonitor.cc',
             '<(libjingle_source)/talk/session/media/currentspeakermonitor.h',
+            '<(libjingle_source)/talk/session/media/externalhmac.cc',
+            '<(libjingle_source)/talk/session/media/externalhmac.h',
             '<(libjingle_source)/talk/session/media/mediamessages.cc',
             '<(libjingle_source)/talk/session/media/mediamessages.h',
             '<(libjingle_source)/talk/session/media/mediamonitor.cc',
             '<(libjingle_source)/talk/session/media/mediamonitor.h',
             '<(libjingle_source)/talk/session/media/mediasession.cc',
             '<(libjingle_source)/talk/session/media/mediasession.h',
             '<(libjingle_source)/talk/session/media/mediasessionclient.cc',
             '<(libjingle_source)/talk/session/media/mediasessionclient.h',
             '<(libjingle_source)/talk/session/media/mediasink.h',
             '<(libjingle_source)/talk/session/media/rtcpmuxfilter.cc',
@@ skipping 188 matching lines @@
               # in this directory and not lib.target as will otherwise be
               # the case with make builds.
               'product_dir': '<(PRODUCT_DIR)/lib',
             }],
           ],
         },  # target libpeerconnection
       ],
     }],
   ],
 }