Looking up device id by session id for AudioRendererMixerInput

content/common/media/audio_messages.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.
 
 // IPC messages for the audio.
 // Multiply-included message file, hence no include guard.
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 31 matching lines @@
   IPC_STRUCT_MEMBER(media::AudioParameters, params)
   IPC_STRUCT_MEMBER(bool, automatic_gain_control)
   IPC_STRUCT_MEMBER(uint32_t, shared_memory_count)
 IPC_STRUCT_END()
 
 // Messages sent from the browser to the renderer.
 
 // Tell the renderer process that an audio output device has been authorized
 // for a given stream. The renderer is given the output parameters for the
 // authorized device.
-IPC_MESSAGE_CONTROL3(AudioMsg_NotifyDeviceAuthorized,
+IPC_MESSAGE_CONTROL4(AudioMsg_NotifyDeviceAuthorized,
                      int /* stream id */,
                      media::OutputDeviceStatus /* device_status */,
-                     media::AudioParameters /* output parameters */)
+                     media::AudioParameters /* output parameters */,
+                     std::string /* matched_device_id */)
 
 // Tell the renderer process that an audio stream has been created.
 // The renderer process is given a shared memory handle for the audio data
 // buffer it shares with the browser process. It is also given a SyncSocket that
 // it uses to communicate with the browser process about the state of the
 // buffered audio data.
 IPC_MESSAGE_CONTROL4(
     AudioMsg_NotifyStreamCreated,
     int /* stream id */,
     base::SharedMemoryHandle /* handle */,
@@ skipping 76 matching lines @@
 // Set audio volume of the stream specified by stream_id.
 // TODO(hclam): change this to vector if we have channel numbers other than 2.
 IPC_MESSAGE_CONTROL2(AudioHostMsg_SetVolume,
                      int /* stream_id */,
                      double /* volume */)
 
 // Set audio volume of the input stream specified by stream_id.
 IPC_MESSAGE_CONTROL2(AudioInputHostMsg_SetVolume,
                      int /* stream_id */,
                      double /* volume */)