Add AudioManager::GetAudioOutputDeviceNames and implement for pulseaudio.

media/audio/pulse/audio_manager_pulse.h

 // Copyright 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.
 
 #ifndef MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
 #define MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
 
 #include <pulse/pulseaudio.h>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "media/audio/audio_manager_base.h"
 
 namespace media {
 
 class MEDIA_EXPORT AudioManagerPulse : public AudioManagerBase {
  public:
   AudioManagerPulse();
   virtual ~AudioManagerPulse();
 
   static AudioManager* Create();
 
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices() OVERRIDE;
   virtual bool HasAudioInputDevices() OVERRIDE;
   virtual void ShowAudioInputSettings() OVERRIDE;
   virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
       OVERRIDE;
+  virtual void GetAudioOutputDeviceNames(media::AudioDeviceNames* device_names)
+      OVERRIDE;
   virtual AudioParameters GetInputStreamParameters(
       const std::string& device_id) OVERRIDE;
 
   // Implementation of AudioManagerBase.
   virtual AudioOutputStream* MakeLinearOutputStream(
       const AudioParameters& params) OVERRIDE;
   virtual AudioOutputStream* MakeLowLatencyOutputStream(
       const AudioParameters& params,
       const std::string& input_device_id) OVERRIDE;
   virtual AudioInputStream* MakeLinearInputStream(
@@ skipping 38 matching lines @@
   pa_context* input_context_;
   AudioDeviceNames* devices_;
   int native_input_sample_rate_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_