Move Alsa device opening into the audio thread, and add in support for multi-channel audio.

media/media.gyp

 # Copyright (c) 2009 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,
   },
   'target_defaults': {
     'conditions': [
@@ skipping 44 matching lines @@
         'base/clock.h',
         'base/clock_impl.cc',
         'base/clock_impl.h',
         'base/data_buffer.cc',
         'base/data_buffer.h',
         'base/djb2.cc',
         'base/djb2.h',
         'base/factory.h',
         'base/filter_host.h',
         'base/filters.h',
-        'base/media_posix.cc',
-        'base/media_win.cc',
         'base/media.h',
         'base/media_format.cc',
         'base/media_format.h',
+        'base/media_posix.cc',
+        'base/media_switches.cc',
+        'base/media_switches.h',
+        'base/media_win.cc',
         'base/pipeline.h',
         'base/pipeline_impl.cc',
         'base/pipeline_impl.h',
         'base/seekable_buffer.cc',
         'base/seekable_buffer.h',
         'base/synchronizer.cc',
         'base/synchronizer.h',
         'base/video_frame_impl.cc',
         'base/video_frame_impl.h',
         'base/yuv_convert.cc',
@@ skipping 200 matching lines @@
       ],
     }],
   ],
 }
 
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