Add a virtual beamforming audio device on ChromeOS.

content/renderer/media/media_stream_audio_processor_options.h

 // Copyright 2013 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 CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_
 
 #include <string>
 
 #include "base/files/file.h"
@@ skipping 122 matching lines @@
 // This method has no impact if echo cancellation dump has not been started on
 // |audio_processing|.
 void StopEchoCancellationDump(AudioProcessing* audio_processing);
 
 void EnableAutomaticGainControl(AudioProcessing* audio_processing);
 
 void GetAecStats(webrtc::EchoCancellation* echo_cancellation,
                  webrtc::AudioProcessorInterface::AudioProcessorStats* stats);
 
 // Parses the microphone array geometry from |geometry_string| formatted as
-// "x1 y1 z1 ... xn yn zn" for an n-microphone array. See
-// switches::kMicrophonePositions for more detail.
+// "x1 y1 z1 ... xn yn zn" for an n-microphone array. See the mic_positions_
+// member of AudioParameters for more detail.
 //
 // Returns a zero-sized vector if |geometry_string| isn't a parseable geometry.
 CONTENT_EXPORT std::vector<webrtc::Point> ParseArrayGeometry(
     const std::string& geometry_string);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_