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

Source/core/html/HTMLObjectElement.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, 2007, 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 368 matching lines @@
             return;
         }
     }
 
     m_useFallbackContent = true;
 
     // FIXME: Style gets recalculated which is suboptimal.
     reattachFallbackContent();
 }
 
+bool HTMLObjectElement::isExposed() const
+{
+    // http://www.whatwg.org/specs/web-apps/current-work/#exposed
+    for (Node* ancestor = parentNode(); ancestor; ancestor = ancestor->parentNode()) {

[abarth-chromium, 2013/11/18 17:38:58]

Are these ancestor traversals correct w.r.t. shadow DOM?  Can you add some tests
for the cases where there's a shadow DOM boundary between the <object> and an
ancestor <object>?

[sof, 2013/11/18 20:37:35]

Thanks. Does

  https://codereview.chromium.org/75273004/patch/40001/50004

address it? I'm on thin ice wrt shadow DOM know-how.

+        if (ancestor->hasTagName(objectTag) && toHTMLObjectElement(ancestor)->isExposed())
+            return false;
+    }
+    if (hasFallbackContent() && !useFallbackContent())
+        return true;
+    for (Node* node = firstChild(); node; node = NodeTraversal::next(*node, this)) {
+        if (node->hasTagName(objectTag) || node->hasTagName(embedTag))
+            return false;
+    }
+    return true;
+}
+
 bool HTMLObjectElement::containsJavaApplet() const
 {
     if (MIMETypeRegistry::isJavaAppletMIMEType(getAttribute(typeAttr)))
         return true;
 
     for (Element* child = ElementTraversal::firstWithin(*this); child; child = ElementTraversal::nextSkippingChildren(*child, this)) {
         if (child->hasTagName(paramTag)
                 && equalIgnoringCase(child->getNameAttribute(), "type")
                 && MIMETypeRegistry::isJavaAppletMIMEType(child->getAttribute(valueAttr).string()))
             return true;
@@ skipping 44 matching lines @@
 {
     return FormAssociatedElement::form();
 }
 
 bool HTMLObjectElement::isInteractiveContent() const
 {
     return fastHasAttribute(usemapAttr);
 }
 
 }