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

media/base/audio_renderer_sink.h

 // 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.
 
 #ifndef MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 52 matching lines @@
   // Returns |true| on success.
   virtual bool SetVolume(double volume) = 0;
 
   // Returns current output device information. If the information is not
   // available yet, this method may block until it becomes available.
   // If the sink is not associated with any output device, |device_status| of
   // OutputDeviceInfo should be set to OUTPUT_DEVICE_STATUS_ERROR_INTERNAL.
   // 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() {}
 };
 
 // Same as AudioRendererSink except that Initialize() and Start() can be called
 // again after Stop().
 // TODO(sandersd): Fold back into AudioRendererSink once all subclasses support
 // this.
 
@@ skipping 13 matching lines @@
                                   const url::Origin& security_origin,
                                   const OutputDeviceStatusCB& callback) = 0;
 
  protected:
   ~SwitchableAudioRendererSink() override {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_SINK_H_