Change audio render thread checking to use new AudioRendererSink::BelongsToRendererThread()

media/base/audio_renderer_mixer_input.cc

Index: media/base/audio_renderer_mixer_input.cc
diff --git a/media/base/audio_renderer_mixer_input.cc b/media/base/audio_renderer_mixer_input.cc
index 921a0174b7768bb8a18025ec9c3f3eacd2cf1ed5..0e8eb389f81340dab2fe92dc9da4863677b62028 100644
--- a/media/base/audio_renderer_mixer_input.cc
+++ b/media/base/audio_renderer_mixer_input.cc
@@ -122,6 +122,11 @@ OutputDeviceInfo AudioRendererMixerInput::GetOutputDeviceInfo() {
                                                 device_id_, security_origin_);
 }
 
+bool AudioRendererMixerInput::BelongsToRenderingThread() {
+  NOTIMPLEMENTED();

[DaleCurtis, 2016/06/10 18:24:49]

Ditto.

[Henrik Grunell, 2016/06/13 12:46:15]

There's no as simple implementation as for NullAudioSink. It would have to be
forwarded to the mixer, which is of course not complicated but a new lock needs
to be introduced to protect |mixer_|. And since no one will use this right now,
it seems unnecessary. When WebRTC is added to mixers, it can be implemented in a
suitable way. (The code here may change.)

+  return false;
+}
+
 void AudioRendererMixerInput::SwitchOutputDevice(
     const std::string& device_id,
     const url::Origin& security_origin,