Adds method to provide custom AudioManager at runtime.

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 1088 matching lines @@
         '../ui/gfx/gfx.gyp:gfx_test_support',
         '../url/url.gyp:url_lib',
       ],
       'sources': [
         'audio/alsa/alsa_output_unittest.cc',
         'audio/android/audio_android_unittest.cc',
         'audio/audio_input_controller_unittest.cc',
         'audio/audio_input_unittest.cc',
         'audio/audio_input_volume_unittest.cc',
         'audio/audio_low_latency_input_output_unittest.cc',
+        'audio/audio_manager_factory_unittest.cc',
         'audio/audio_manager_unittest.cc',
         'audio/audio_output_controller_unittest.cc',
         'audio/audio_output_device_unittest.cc',
         'audio/audio_output_proxy_unittest.cc',
         'audio/audio_parameters_unittest.cc',
         'audio/audio_power_monitor_unittest.cc',
         'audio/fake_audio_worker_unittest.cc',
         'audio/mac/audio_auhal_mac_unittest.cc',
         'audio/mac/audio_device_listener_mac_unittest.cc',
         'audio/mac/audio_low_latency_input_mac_unittest.cc',
@@ skipping 774 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'media_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }