Add AudioManager::GetAudioOutputDeviceNames and implement for pulseaudio.

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 895 matching lines @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../ui/ui.gyp:ui',
       ],
       'sources': [
         'audio/audio_input_controller_unittest.cc',
         'audio/audio_input_device_unittest.cc',
         'audio/audio_input_unittest.cc',
         'audio/audio_input_volume_unittest.cc',
         'audio/audio_low_latency_input_output_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_consumer_unittest.cc',
         'audio/ios/audio_manager_ios_unittest.cc',
         'audio/linux/alsa_output_unittest.cc',
         'audio/mac/audio_auhal_mac_unittest.cc',
         'audio/mac/audio_device_listener_mac_unittest.cc',
@@ skipping 105 matching lines @@
         }],
         ['media_use_ffmpeg==1', {
           'dependencies': [
             '../third_party/ffmpeg/ffmpeg.gyp:ffmpeg',
           ],
         }, {  # media_use_ffmpeg== 0
           'sources!': [
             'base/media_file_checker_unittest.cc',
           ],
         }],
+        ['use_pulseaudio==1', {
+          'defines': [
+            'USE_PULSEAUDIO',
+          ],
+        }],
         ['os_posix==1 and OS!="mac" and OS!="ios"', {
           'conditions': [
             ['linux_use_tcmalloc==1', {
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         }],
         ['OS=="ios"', {
@@ skipping 530 matching lines @@
                   ],
                 }],
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }