Media Remoting: Add interstitial elements to media element shadow dom.

third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp

Index: third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
diff --git a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
index 46f1f6f2a4d238c5f6729a9a537bb81c2b7fbd85..1dcaab2e60fbbf77e10a899b4957dc3cf730462e 100644
--- a/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
+++ b/third_party/WebKit/Source/modules/media_controls/MediaControlsImpl.cpp
@@ -529,7 +529,9 @@ void MediaControlsImpl::MakeTransparent() {
 bool MediaControlsImpl::ShouldHideMediaControls(unsigned behavior_flags) const {
   // Never hide for a media element without visual representation.
   if (!MediaElement().IsHTMLVideoElement() || !MediaElement().HasVideo() ||
-      MediaElement().IsPlayingRemotely()) {
+      MediaElement().IsPlayingRemotely() ||
+      toHTMLVideoElement(MediaElement()).GetMediaRemotingStatus() ==
+          HTMLVideoElement::MediaRemotingStatus::kStarted) {
     return false;
   }