Reland 15721002: Hook up the device selection to the WebAudio live audio

media/audio/audio_output_ipc.h

Index: media/audio/audio_output_ipc.h
diff --git a/media/audio/audio_output_ipc.h b/media/audio/audio_output_ipc.h
index 78cf2e7caba777e919051a4ed029e0d4b46d9b78..84f8c6a897ccd3ede210f9963935a8436a79e977 100644
--- a/media/audio/audio_output_ipc.h
+++ b/media/audio/audio_output_ipc.h
@@ -61,10 +61,13 @@ class MEDIA_EXPORT AudioOutputIPC {
 
   // Sends a request to create an AudioOutputController object in the peer
   // process and configures it to use the specified audio |params| including
-  // number of synchronized input channels.  Once the stream has been created,
+  // number of synchronized input channels.|session_id| is used by the browser
+  // to select the correct input device if the input channel in |params| is
+  // valid, otherwise it will be ignored.  Once the stream has been created,
   // the implementation will notify |delegate| by calling OnStreamCreated().
   virtual void CreateStream(AudioOutputIPCDelegate* delegate,
-                            const AudioParameters& params) = 0;
+                            const AudioParameters& params,
+                            int session_id) = 0;
 
   // Starts playing the stream.  This should generate a call to
   // AudioOutputController::Play().