Wire up the output device id and provide an implementation on Windows.

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 38a2c03f590faa18dd9c2ca65cf559da6feff23b..6c906ed39c993dfe9ce8aad75930d567e931faae 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -103,8 +103,8 @@ class MEDIA_EXPORT AudioOutputController
   // outlive AudioOutputController.

[henrika (OOO until Aug 14), 2013/09/06 08:44:38]

Should we extend the comment and mention device IDs as well?

[tommi (sloooow) - chröme, 2013/09/06 11:01:35]

Done.

   static scoped_refptr<AudioOutputController> Create(
       AudioManager* audio_manager, EventHandler* event_handler,
-      const AudioParameters& params, const std::string& input_device_id,
-      SyncReader* sync_reader);
+      const AudioParameters& params, const std::string& output_device_id,
+      const std::string& input_device_id, SyncReader* sync_reader);
 
   // Methods to control playback of the stream.
 
@@ -166,6 +166,7 @@ class MEDIA_EXPORT AudioOutputController
 
   AudioOutputController(AudioManager* audio_manager, EventHandler* handler,
                         const AudioParameters& params,
+                        const std::string& output_device_id,
                         const std::string& input_device_id,
                         SyncReader* sync_reader);
 
@@ -198,8 +199,12 @@ class MEDIA_EXPORT AudioOutputController
   const AudioParameters params_;
   EventHandler* const handler_;
 
+  // Specified the device id of the output device to open or empty for the

[henrika (OOO until Aug 14), 2013/09/06 08:44:38]

Specified the device id of... sounds odd to me. Did you mean Specifies...

[tommi (sloooow) - chröme, 2013/09/06 11:01:35]

Yes, thanks, fixed.

+  // default output device.
+  const std::string output_device_id_;
+
   // Used by the unified IO to open the correct input device.
-  std::string input_device_id_;
+  const std::string input_device_id_;
 
   AudioOutputStream* stream_;