Add Mac OS X synchronized audio I/O back-end

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 PulseAudio library.
     'use_pulseaudio%': 0,
     # Override to dynamically link the cras (ChromeOS audio) library.
@@ skipping 99 matching lines @@
         'audio/mac/audio_input_mac.cc',
         'audio/mac/audio_input_mac.h',
         'audio/mac/audio_low_latency_input_mac.cc',
         'audio/mac/audio_low_latency_input_mac.h',
         'audio/mac/audio_low_latency_output_mac.cc',
         'audio/mac/audio_low_latency_output_mac.h',
         'audio/mac/audio_manager_mac.cc',
         'audio/mac/audio_manager_mac.h',
         'audio/mac/audio_output_mac.cc',
         'audio/mac/audio_output_mac.h',
+        'audio/mac/audio_synchronized_mac.cc',
+        'audio/mac/audio_synchronized_mac.h',
         'audio/null_audio_sink.cc',
         'audio/null_audio_sink.h',
         'audio/openbsd/audio_manager_openbsd.cc',
         'audio/openbsd/audio_manager_openbsd.h',
         'audio/pulse/pulse_output.cc',
         'audio/pulse/pulse_output.h',
         'audio/sample_rates.cc',
         'audio/sample_rates.h',
         'audio/scoped_loop_observer.cc',
         'audio/scoped_loop_observer.h',
@@ skipping 1135 matching lines @@
             'media',
           ],
           'sources': [
             'tools/media_bench/media_bench.cc',
           ],
         },
       ],
     }]
   ],
 }