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

media/base/audio_renderer_sink.h

Index: media/base/audio_renderer_sink.h
diff --git a/media/base/audio_renderer_sink.h b/media/base/audio_renderer_sink.h
index b0b5f26a729d3667882ded2265250250430b7c9e..268b9b6c45c33f2bfb02fc4352fb010bd7aed28e 100644
--- a/media/base/audio_renderer_sink.h
+++ b/media/base/audio_renderer_sink.h
@@ -70,6 +70,11 @@ class AudioRendererSink
   // Must never be called on the IO thread.
   virtual OutputDeviceInfo GetOutputDeviceInfo() = 0;
 
+  // If DCHECKs are enabled, this function returns true if called on rendering
+  // thread, otherwise false. With DCHECKs disabled, it returns true. Thus, it
+  // is intended to be used for DCHECKing.

[tommi (sloooow) - chröme, 2016/06/15 19:29:11]

should we make this method only available in builds where DCHECK is enabled?

[Henrik Grunell, 2016/06/16 12:19:16]

Same here, I slightly prefer not to clutter with ifdefs. No strong opinion.

+  virtual bool CurrentThreadIsRenderingThread() = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<AudioRendererSink>;
   virtual ~AudioRendererSink() {}