Add AudioTrackRecorder for audio component of MediaStream recording.

content/content_tests.gypi

 # Copyright (c) 2013 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 732 matching lines @@
     'content_unittests_webrtc_sources': [
       'browser/media/webrtc_internals_unittest.cc',
       'browser/renderer_host/media/webrtc_identity_service_host_unittest.cc',
       'browser/renderer_host/p2p/socket_host_tcp_server_unittest.cc',
       'browser/renderer_host/p2p/socket_host_tcp_unittest.cc',
       'browser/renderer_host/p2p/socket_host_test_utils.cc',
       'browser/renderer_host/p2p/socket_host_test_utils.h',
       'browser/renderer_host/p2p/socket_host_udp_unittest.cc',
       'browser/renderer_host/p2p/socket_host_unittest.cc',
       'renderer/media/audio_repetition_detector_unittest.cc',
+      'renderer/media/audio_track_recorder_unittest.cc',
       'renderer/media/media_recorder_handler_unittest.cc',
       'renderer/media/media_stream_audio_processor_unittest.cc',
       'renderer/media/media_stream_constraints_util_unittest.cc',
       'renderer/media/media_stream_dispatcher_unittest.cc',
       'renderer/media/media_stream_video_capturer_source_unittest.cc',
       'renderer/media/media_stream_video_renderer_sink_unittest.cc',
       'renderer/media/media_stream_video_source_unittest.cc',
       'renderer/media/media_stream_video_track_unittest.cc',
       'renderer/media/mock_media_constraint_factory.cc',
       'renderer/media/mock_media_stream_registry.cc',
@@ skipping 480 matching lines @@
               ],
             }],
             ['OS == "android"', {
               'sources': [ '<@(content_unittests_android_sources)' ],
               'sources!': [
                 'browser/geolocation/network_location_provider_unittest.cc',
                 'browser/geolocation/wifi_data_provider_common_unittest.cc',
                 'browser/power_usage_monitor_impl_unittest.cc',
                 'browser/renderer_host/begin_frame_observer_proxy_unittest.cc',
                 'browser/webui/url_data_manager_backend_unittest.cc',
+                'renderer/media/audio_track_recorder_unittest.cc',
                 'renderer/media/media_recorder_handler_unittest.cc',
                 'renderer/media/video_track_recorder_unittest.cc',
               ],
               'dependencies': [
                 '../testing/android/native_test.gyp:native_test_native_code',
               ],
               'dependencies!': [
                 '../device/battery/battery.gyp:device_battery',
               ],
             }, {  # OS != "android"
@@ skipping 928 matching lines @@
                   'content_unittests_apk.isolate',
                 ],
               },
             ],
           },
         ],
       ],
     }],
   ],
 }