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

third_party/WebKit/Source/core/html/shadow/MediaRemotingInterstitial.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MediaRemotingInterstitial_h
+#define MediaRemotingInterstitial_h
+
+#include "core/html/HTMLDivElement.h"
+
+namespace blink {
+
+class HTMLMediaElement;
+class MediaRemotingDisableButtonElement;
+
+class MediaRemotingInterstitial final : public HTMLDivElement {
+ public:
+  explicit MediaRemotingInterstitial(HTMLMediaElement&);
+
+  // Show/Hide Media Remoting interstitial.
+  void show();
+  void hide();
+
+  HTMLMediaElement& mediaElement() const { return *m_mediaElement; }
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  // Node override.
+  bool isMediaControls() const override { return true; }
+
+  Member<HTMLMediaElement> m_mediaElement;
+  Member<MediaRemotingDisableButtonElement> m_mediaRemotingDisableButton;
+};
+
+}  // namespace
+
+#endif  // MediaRemotingInterstitial_h