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 HTMLImageElement;
+class HTMLVideoElement;
+class MediaRemotingExitButtonElement;
+class MediaRemotingCastMessageElement;
+class MediaRemotingCastIconElement;
+
+// Media Remoting UI. DOM structure looks like:
+//
+// MediaRemotingInterstitial
+//     (-internal-media-remoting-interstitial)
+// +-HTMLImageElement
+// |    (-internal-media-remoting-background-image)
+// \-MediaRemotingCastIconElement
+// |    (-internal-media-remoting-cast-icon)
+// \-MediaRemotingCastMessageElement
+// |    (-internal-media-remoting-cast-text-message)
+// \-MediaRemotingExitButtonElement
+//      (-internal-media-remoting-disable-button)
+class MediaRemotingInterstitial final : public HTMLDivElement {
+ public:
+  explicit MediaRemotingInterstitial(HTMLVideoElement&);
+
+  // Show/Hide Media Remoting interstitial.
+  void Show();
+  void Hide();
+  void OnPosterImageChanged();
+
+  HTMLVideoElement& GetVideoElement() const { return *video_element_; }
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  // Node override.
+  bool IsMediaRemotingInterstitial() const override { return true; }
+
+  Member<HTMLVideoElement> video_element_;
+  Member<HTMLImageElement> background_image_;
+  Member<MediaRemotingExitButtonElement> exit_button_;
+  Member<MediaRemotingCastIconElement> cast_icon_;
+  Member<MediaRemotingCastMessageElement> cast_text_message_;
+};
+
+}  // namespace
+
+#endif  // MediaRemotingInterstitial_h