Add a virtual beamforming audio device on ChromeOS.

content/common/media/media_stream_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 media streaming.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
 #include "content/common/content_export.h"
@@ skipping 32 matching lines @@
 IPC_STRUCT_TRAITS_BEGIN(content::StreamDeviceInfo)
   IPC_STRUCT_TRAITS_MEMBER(device.type)
   IPC_STRUCT_TRAITS_MEMBER(device.name)
   IPC_STRUCT_TRAITS_MEMBER(device.id)
   IPC_STRUCT_TRAITS_MEMBER(device.video_facing)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output_device_id)
   IPC_STRUCT_TRAITS_MEMBER(device.input.sample_rate)
   IPC_STRUCT_TRAITS_MEMBER(device.input.channel_layout)
   IPC_STRUCT_TRAITS_MEMBER(device.input.frames_per_buffer)
   IPC_STRUCT_TRAITS_MEMBER(device.input.effects)
+  IPC_STRUCT_TRAITS_MEMBER(device.input.mic_positions)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output.sample_rate)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output.channel_layout)
   IPC_STRUCT_TRAITS_MEMBER(device.matched_output.frames_per_buffer)
   IPC_STRUCT_TRAITS_MEMBER(session_id)
 IPC_STRUCT_TRAITS_END()
 
 // Message sent from the browser to the renderer
 
 // The browser has generated a stream successfully.
 IPC_MESSAGE_ROUTED4(MediaStreamMsg_StreamGenerated,
@@ skipping 70 matching lines @@
                      int /* render frame id */,
                      int /* request id */,
                      std::string /* device_id */,
                      content::MediaStreamType /* type */,
                      GURL /* security origin */)
 
 // Request to close a device.
 IPC_MESSAGE_CONTROL2(MediaStreamHostMsg_CloseDevice,
                      int /* render frame id */,
                      std::string /*label*/)