MediaStream audio sourcing: Bypass audio processing for non-WebRTC cases.

content/renderer/media/media_stream_center.cc

Index: content/renderer/media/media_stream_center.cc
diff --git a/content/renderer/media/media_stream_center.cc b/content/renderer/media/media_stream_center.cc
index ad7f8ddf6f1c2281a6f693fab87fab0b419e3cd0..b5281a88dfbb61c6f813a2a68eb0d407a5b9bf26 100644
--- a/content/renderer/media/media_stream_center.cc
+++ b/content/renderer/media/media_stream_center.cc
@@ -15,6 +15,7 @@
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/media/media_stream.h"
+#include "content/renderer/media/media_stream_audio_track.h"
 #include "content/renderer/media/media_stream_source.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
@@ -40,7 +41,7 @@ namespace {
 void CreateNativeAudioMediaStreamTrack(
     const blink::WebMediaStreamTrack& track,
     PeerConnectionDependencyFactory* factory) {
-  DCHECK(!track.extraData());
+  DCHECK(!MediaStreamAudioTrack::GetTrack(track));
   blink::WebMediaStreamSource source = track.source();
   DCHECK_EQ(source.type(), blink::WebMediaStreamSource::TypeAudio);
   if (source.remote()) {
@@ -130,9 +131,7 @@ blink::WebAudioSourceProvider*
 MediaStreamCenter::createWebAudioSourceFromMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   DVLOG(1) << "MediaStreamCenter::createWebAudioSourceFromMediaStreamTrack";
-  MediaStreamTrack* media_stream_track =
-      static_cast<MediaStreamTrack*>(track.extraData());
-  if (!media_stream_track) {
+  if (!MediaStreamAudioTrack::GetTrack(track)) {
     DLOG(ERROR) << "Native track missing for webaudio source.";
     return nullptr;
   }