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 332 matching lines @@
   InsertionNotificationRequest InsertedInto(ContainerNode*) override;
   void RemovedFrom(ContainerNode*) override;
 
   void DidMoveToNewDocument(Document& old_document) override;
   virtual KURL PosterImageURL() const { return KURL(); }
 
   enum DisplayMode { kUnknown, kPoster, kVideo };
   DisplayMode GetDisplayMode() const { return display_mode_; }
   virtual void SetDisplayMode(DisplayMode mode) { display_mode_ = 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