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

third_party/WebKit/Source/core/html/shadow/MediaRemotingElements.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 MediaRemotingElements_h
+#define MediaRemotingElements_h
+
+#include "core/html/shadow/MediaRemotingInterstitial.h"
+
+namespace blink {
+
+// A button shown when media remoting starts. It allows user to click to exit
+// media remoting and back to traditional tab mirroring.
+class MediaRemotingExitButtonElement final : public HTMLDivElement {
+ public:
+  explicit MediaRemotingExitButtonElement(MediaRemotingInterstitial&);
+
+  void OnShown();
+  void OnHidden();
+  HTMLVideoElement& GetVideoElement() const;
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  class MouseEventsListener;
+
+  Member<MediaRemotingInterstitial> interstitial_;
+  // A document event listener to listen to the mouse clicking events while
+  // media remoting is ongoing. This listener is used instead of the
+  // DefaultEventHandler() to avoid other web sites stopping propagating the
+  // events. It will be removed once media remoting stops.
+  Member<MouseEventsListener> listener_;
+};
+
+// A text message shown to indicate media remoting is ongoing.
+class MediaRemotingCastMessageElement final : public HTMLDivElement {
+ public:
+  explicit MediaRemotingCastMessageElement(MediaRemotingInterstitial&);
+};
+
+// An icon shown to indicate media remoting is ongoing.
+class MediaRemotingCastIconElement final : public HTMLDivElement {
+ public:
+  explicit MediaRemotingCastIconElement(MediaRemotingInterstitial&);
+};
+
+}  // namespace blink
+
+#endif  // MediaRemotingElements_h