Add a virtual beamforming audio device on ChromeOS.

content/renderer/media/webrtc_local_audio_renderer.cc

 // 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.
 
 #include "content/renderer/media/webrtc_local_audio_renderer.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
@@ skipping 257 matching lines @@
   }
 
   if (source_params_.Equals(params))
     return;
 
   // Reset the |source_params_|, |sink_params_| and |loopback_fifo_| to match
   // the new format.
 
   source_params_ = params;
 
-  sink_params_ = media::AudioParameters(source_params_.format(),
-      source_params_.channel_layout(), source_params_.sample_rate(),
-      source_params_.bits_per_sample(),
+  sink_params_ = media::AudioParameters(
+      source_params_.format(), source_params_.channel_layout(),
+      source_params_.sample_rate(), source_params_.bits_per_sample(),
       WebRtcAudioRenderer::GetOptimalBufferSize(source_params_.sample_rate(),
                                                 frames_per_buffer_),
+      "",
       // If DUCKING is enabled on the source, it needs to be enabled on the
       // sink as well.
       source_params_.effects() | implicit_ducking_effect);
 
   {
     // Note: The max buffer is fairly large, but will rarely be used.
     // Cast needs the buffer to hold at least one second of audio.
     // The clock accuracy is set to 20ms because clock accuracy is
     // ~15ms on windows.
     media::AudioShifter* const new_shifter = new media::AudioShifter(
@@ skipping 15 matching lines @@
   if (sink_started_) {
     sink_->Stop();
     sink_started_ = false;
   }
 
   sink_ = AudioDeviceFactory::NewOutputDevice(source_render_frame_id_);
   MaybeStartSink();
 }
 
 }  // namespace content