Implement hook to change audio output device for PulseAudio.

media/audio/pulse/pulse_util.h

 // 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.
 
 #ifndef MEDIA_AUDIO_PULSE_PULSE_UTIL_H_
 #define MEDIA_AUDIO_PULSE_PULSE_UTIL_H_
 
 #include <pulse/pulseaudio.h>
 
 #include "base/basictypes.h"
@@ skipping 51 matching lines @@
                        void* user_data);
 
 // Create a playback stream for the threaded mainloop, return true if success,
 // otherwise false. This function will create a new Pulse threaded mainloop,
 // and the handles of the mainloop, context and stream will be returned by
 // |mainloop|, |context| and |stream|.
 bool CreateOutputStream(pa_threaded_mainloop** mainloop,
                         pa_context** context,
                         pa_stream** stream,
                         const AudioParameters& params,
+                        const std::string& device_id,
                         pa_stream_notify_cb_t stream_callback,
                         pa_stream_request_cb_t write_callback,
                         void* user_data);
 
 }  // namespace pulse
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_PULSE_PULSE_UTIL_H_