MediaStreamAudioDestination channelCountMode is "explicit"

third_party/WebKit/Source/modules/webaudio/MediaStreamAudioDestinationNode.cpp

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 47 matching lines @@
   audio_sources.push_back(source_.Get());
   MediaStreamSourceVector video_sources;
   stream_ = MediaStream::Create(
       node.context()->GetExecutionContext(),
       MediaStreamDescriptor::Create(audio_sources, video_sources));
   MediaStreamCenter::Instance().DidCreateMediaStreamAndTracks(
       stream_->Descriptor());
 
   source_->SetAudioFormat(number_of_channels, node.context()->sampleRate());
 
+  SetInternalChannelCountMode(kExplicit);
   Initialize();
 }
 
 PassRefPtr<MediaStreamAudioDestinationHandler>
 MediaStreamAudioDestinationHandler::Create(AudioNode& node,
                                            size_t number_of_channels) {
   return AdoptRef(
       new MediaStreamAudioDestinationHandler(node, number_of_channels));
 }
 
@@ skipping 103 matching lines @@
   node->HandleChannelOptions(options, exception_state);
 
   return node;
 }
 
 MediaStream* MediaStreamAudioDestinationNode::stream() const {
   return static_cast<MediaStreamAudioDestinationHandler&>(Handler()).Stream();
 }
 
 }  // namespace blink