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

third_party/WebKit/Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 326 matching lines @@
   InsertionNotificationRequest insertedInto(ContainerNode*) override;
   void removedFrom(ContainerNode*) override;
 
   void didMoveToNewDocument(Document& oldDocument) override;
   virtual KURL posterImageURL() const { return KURL(); }
 
   enum DisplayMode { Unknown, Poster, Video };
   DisplayMode getDisplayMode() const { return m_displayMode; }
   virtual void setDisplayMode(DisplayMode mode) { m_displayMode = mode; }
 
+  // Assert the correct order of the children in shadow dom when DCHECK is on.
+  static void assertShadowRootChildren(ShadowRoot&);
+
  private:
   // Friend class for testing.
   friend class MediaElementFillingViewportTest;
 
   void resetMediaPlayerAndMediaSource();
 
   bool alwaysCreateUserAgentShadowRoot() const final { return true; }
   bool areAuthorShadowsAllowed() const final { return false; }
 
   bool supportsFocus() const final;
@@ skipping 406 matching lines @@
 
 inline bool isHTMLMediaElement(const HTMLElement& element) {
   return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 }  // namespace blink
 
 #endif  // HTMLMediaElement_h