Make AudioOutputDevice restartable and reinitializable

content/renderer/media/webaudio_capturer_source.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/webaudio_capturer_source.h"
 
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "content/renderer/media/webrtc_local_audio_track.h"
 
@@ skipping 67 matching lines @@
     track_ = NULL;
   }
   // removeFromBlinkSource() should not be called while |lock_| is acquired,
   // as it could result in a deadlock.
   removeFromBlinkSource();
 }
 
 void WebAudioCapturerSource::consumeAudio(
     const blink::WebVector<const float*>& audio_data,
     size_t number_of_frames) {
+
   base::AutoLock auto_lock(lock_);
   if (!track_)
     return;
 
   // Update the downstream client if the audio format has been changed.
   if (audio_format_changed_) {
     track_->OnSetFormat(params_);
     audio_format_changed_ = false;
   }
 
@@ skipping 36 matching lines @@
 // WebAudioCapturerSource reference still registered as an audio consumer on
 // the blink side.
 void WebAudioCapturerSource::removeFromBlinkSource() {
   if (!blink_source_.isNull()) {
     blink_source_.removeAudioConsumer(this);
     blink_source_.reset();
   }
 }
 
 }  // namespace content