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

media/audio/audio_output_device.cc

Index: media/audio/audio_output_device.cc
diff --git a/media/audio/audio_output_device.cc b/media/audio/audio_output_device.cc
index 12d102c4ad196911c9ddfb7430e60da7ca99093b..e618b3b5242f41ee4838137099788cf36ec1ad4c 100644
--- a/media/audio/audio_output_device.cc
+++ b/media/audio/audio_output_device.cc
@@ -41,6 +41,10 @@ class AudioOutputDevice::AudioThreadCallback
   // Called whenever we receive notifications about pending data.
   void Process(uint32_t pending_data) override;
 
+  // Returns whether the current thread is the audio device thread or not.
+  // Will always return true if DCHECKs are not enabled.
+  bool CurrentThreadIsAudioDeviceThread();
+
  private:
   AudioRendererSink::RenderCallback* render_callback_;
   std::unique_ptr<AudioBus> output_bus_;
@@ -154,6 +158,13 @@ OutputDeviceInfo AudioOutputDevice::GetOutputDeviceInfo() {
                           device_status_, output_params_);
 }
 
+bool AudioOutputDevice::CurrentThreadIsRenderingThread() {
+  // Since this function is supposed to be called on the rendering thread,
+  // it's safe to access |audio_callback_| here. It will always be valid when
+  // the rendering thread is running.
+  return audio_callback_->CurrentThreadIsAudioDeviceThread();
+}
+
 void AudioOutputDevice::RequestDeviceAuthorizationOnIOThread() {
   DCHECK(task_runner()->BelongsToCurrentThread());
   DCHECK_EQ(state_, IDLE);
@@ -477,4 +488,9 @@ void AudioOutputDevice::AudioThreadCallback::Process(uint32_t pending_data) {
                            frames_skipped);
 }
 
+bool AudioOutputDevice::AudioThreadCallback::
+    CurrentThreadIsAudioDeviceThread() {
+  return thread_checker_.CalledOnValidThread();
+}
+
 }  // namespace media