Introduce AudioClock to improve playback delay calculations.

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 339 matching lines @@
         'base/yuv_convert.h',
         'cdm/aes_decryptor.cc',
         'cdm/aes_decryptor.h',
         'cdm/json_web_key.cc',
         'cdm/json_web_key.h',
         'cdm/key_system_names.cc',
         'cdm/key_system_names.h',
         'ffmpeg/ffmpeg_common.cc',
         'ffmpeg/ffmpeg_common.h',
         'ffmpeg/ffmpeg_deleters.h',
+        'filters/audio_clock.cc',
+        'filters/audio_clock.h',
         'filters/audio_file_reader.cc',
         'filters/audio_file_reader.h',
         'filters/audio_renderer_algorithm.cc',
         'filters/audio_renderer_algorithm.h',
         'filters/audio_renderer_impl.cc',
         'filters/audio_renderer_impl.h',
         'filters/blocking_url_protocol.cc',
         'filters/blocking_url_protocol.h',
         'filters/chunk_demuxer.cc',
         'filters/chunk_demuxer.h',
@@ skipping 641 matching lines @@
         'base/user_input_monitor_unittest.cc',
         'base/vector_math_testing.h',
         'base/vector_math_unittest.cc',
         'base/video_frame_unittest.cc',
         'base/video_frame_pool_unittest.cc',
         'base/video_util_unittest.cc',
         'base/yuv_convert_unittest.cc',
         'cdm/aes_decryptor_unittest.cc',
         'cdm/json_web_key_unittest.cc',
         'ffmpeg/ffmpeg_common_unittest.cc',
+        'filters/audio_clock_unittest.cc',
         'filters/audio_decoder_selector_unittest.cc',
         'filters/audio_file_reader_unittest.cc',
         'filters/audio_renderer_algorithm_unittest.cc',
         'filters/audio_renderer_impl_unittest.cc',
         'filters/blocking_url_protocol_unittest.cc',
         'filters/chunk_demuxer_unittest.cc',
         'filters/decrypting_audio_decoder_unittest.cc',
         'filters/decrypting_demuxer_stream_unittest.cc',
         'filters/decrypting_video_decoder_unittest.cc',
         'filters/fake_demuxer_stream.cc',
@@ skipping 667 matching lines @@
                   ],
                 }],
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }