Forward the number of skipped frames by the OS in audio playout.

media/base/fake_audio_renderer_sink.cc

Index: media/base/fake_audio_renderer_sink.cc
diff --git a/media/base/fake_audio_renderer_sink.cc b/media/base/fake_audio_renderer_sink.cc
index d8a72629d961c8fdb374861b4032ef5f47b9a559..be03092c9d51e65f4eb3f18cecacd48c9b54f863 100644
--- a/media/base/fake_audio_renderer_sink.cc
+++ b/media/base/fake_audio_renderer_sink.cc
@@ -65,7 +65,7 @@ bool FakeAudioRendererSink::Render(AudioBus* dest, int audio_delay_milliseconds,
   if (state_ != kPlaying)
     return false;
 
-  *frames_written = callback_->Render(dest, audio_delay_milliseconds);
+  *frames_written = callback_->Render(dest, audio_delay_milliseconds, 0);
   return true;
 }