Add a media constraint to enable beamforming.

content/renderer/media/media_stream_audio_processor.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_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_
 
 #include "base/atomicops.h"
 #include "base/files/file.h"
 #include "base/synchronization/lock.h"
@@ skipping 110 matching lines @@
                      int audio_delay_milliseconds) override;
   void OnPlayoutDataSourceChanged() override;
 
   // webrtc::AudioProcessorInterface implementation.
   // This method is called on the libjingle thread.
   void GetStats(AudioProcessorStats* stats) override;
 
   // Helper to initialize the WebRtc AudioProcessing.
   void InitializeAudioProcessingModule(
       const blink::WebMediaConstraints& constraints, int effects);
+  void ConfigBeamforming(webrtc::Config* config);

[ajm, 2015/01/08 00:03:17]

nit: ConfigureBeamforming?

[aluebs-chromium, 2015/01/08 00:29:17]

Done.

 
   // Helper to initialize the capture converter.
   void InitializeCaptureFifo(const media::AudioParameters& input_format);
 
   // Helper to initialize the render converter.
   void InitializeRenderFifoIfNeeded(int sample_rate,
                                     int number_of_channels,
                                     int frames_per_buffer);
 
   // Called by ProcessAndConsumeData().
@@ skipping 58 matching lines @@
   // Object for logging echo information when the AEC is enabled. Accessible by
   // the libjingle thread through GetStats().
   scoped_ptr<EchoInformation> echo_information_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamAudioProcessor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_H_