Update WebmMuxer for audio component of MediaStream recording.

media/media.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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 539 matching lines @@
         'filters/h264_parser.cc',
         'filters/h264_parser.h',
         'filters/ivf_parser.cc',
         'filters/ivf_parser.h',
         'filters/in_memory_url_protocol.cc',
         'filters/in_memory_url_protocol.h',
         'filters/jpeg_parser.cc',
         'filters/jpeg_parser.h',
         'filters/opus_audio_decoder.cc',
         'filters/opus_audio_decoder.h',
+        'filters/opus_constants.cc',
+        'filters/opus_constants.h',
         'filters/source_buffer_range.cc',
         'filters/source_buffer_range.h',
         'filters/source_buffer_stream.cc',
         'filters/source_buffer_stream.h',
         'filters/stream_parser_factory.cc',
         'filters/stream_parser_factory.h',
         'filters/video_cadence_estimator.cc',
         'filters/video_cadence_estimator.h',
         'filters/video_renderer_algorithm.cc',
         'filters/video_renderer_algorithm.h',
@@ skipping 1541 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }