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

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 30cbfef5ae3b82b27375346d90b47f5b5c4ef577..b45c0fc9ed6a47b9bb80210ec26c7242e538bedc 100644
--- a/media/base/audio_renderer_sink.h
+++ b/media/base/audio_renderer_sink.h
@@ -35,8 +35,11 @@ class AudioRendererSink
   class RenderCallback {
    public:
     // Attempts to completely fill all channels of |dest|, returns actual
-    // number of frames filled.
-    virtual int Render(AudioBus* dest, int audio_delay_milliseconds) = 0;
+    // number of frames filled. |frames_skipped| contains the number of frames
+    // the consumer has skipped, if any.
+    virtual int Render(AudioBus* dest,
+                       uint32_t audio_delay_milliseconds,
+                       uint32_t frames_skipped) = 0;
 
     // Signals an error has occurred.
     virtual void OnRenderError() = 0;