cc: Video layers without a frame should not occlude

content/renderer/media/webmediaplayer_ms.cc

Index: content/renderer/media/webmediaplayer_ms.cc
diff --git a/content/renderer/media/webmediaplayer_ms.cc b/content/renderer/media/webmediaplayer_ms.cc
index de6f33b71eb086da1b77295b66ca801bb7251fae..556d58a8b13c0c61c45438e5ca019034f7af1f78 100644
--- a/content/renderer/media/webmediaplayer_ms.cc
+++ b/content/renderer/media/webmediaplayer_ms.cc
@@ -464,6 +464,11 @@ bool WebMediaPlayerMS::UpdateCurrentFrame(base::TimeTicks deadline_min,
   return false;
 }
 
+bool WebMediaPlayerMS::HasCurrentFrame() {
+  base::AutoLock auto_lock(current_frame_lock_);
+  return current_frame_;
+}
+
 scoped_refptr<media::VideoFrame> WebMediaPlayerMS::GetCurrentFrame() {
   DVLOG(3) << "WebMediaPlayerMS::GetCurrentFrame";
   base::AutoLock auto_lock(current_frame_lock_);