MediaRecorder: wire the bitRate settings in Blink and content (2nd go)

content/renderer/media/audio_track_recorder.h

 // Copyright 2015 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_AUDIO_TRACK_RECORDER_H_
 #define CONTENT_RENDERER_MEDIA_AUDIO_TRACK_RECORDER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 19 matching lines @@
 // threading subtleties, see the implementation file.
 class CONTENT_EXPORT AudioTrackRecorder
     : NON_EXPORTED_BASE(public MediaStreamAudioSink) {
  public:
   using OnEncodedAudioCB =
       base::Callback<void(const media::AudioParameters& params,
                           scoped_ptr<std::string> encoded_data,
                           base::TimeTicks capture_time)>;
 
   AudioTrackRecorder(const blink::WebMediaStreamTrack& track,
-                     const OnEncodedAudioCB& on_encoded_audio_cb);
+                     const OnEncodedAudioCB& on_encoded_audio_cb,
+                     int32_t bits_per_second);
   ~AudioTrackRecorder() override;
 
   // Implement MediaStreamAudioSink.
   void OnSetFormat(const media::AudioParameters& params) override;
   void OnData(const media::AudioBus& audio_bus,
               base::TimeTicks capture_time) override;
 
  private:
   friend class AudioTrackRecorderTest;
   class AudioParameters;
@@ skipping 25 matching lines @@
   const scoped_refptr<AudioEncoder> encoder_;
   // The thread on which |encoder_| works.
   base::Thread encoder_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioTrackRecorder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_TRACK_RECORDER_H_