Add 'exposed' objects and embeds to a document's named properties.

Source/core/html/HTMLEmbedElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 196 matching lines @@
     HTMLPlugInElement::addSubresourceAttributeURLs(urls);
 
     addSubresourceURL(urls, document().completeURL(getAttribute(srcAttr)));
 }
 
 bool HTMLEmbedElement::isInteractiveContent() const
 {
     return true;
 }
 
+bool HTMLEmbedElement::isExposed() const
+{
+    // http://www.whatwg.org/specs/web-apps/current-work/#exposed
+    for (Node* ancestor = parentNode(); ancestor; ancestor = ancestor->parentNode()) {
+        if (ancestor->hasTagName(objectTag) && toHTMLObjectElement(ancestor)->isExposed())
+            return false;
+    }
+    return true;
+}
+
 }