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

Source/core/html/HTMLEmbedElement.cpp

Index: Source/core/html/HTMLEmbedElement.cpp
diff --git a/Source/core/html/HTMLEmbedElement.cpp b/Source/core/html/HTMLEmbedElement.cpp
index 69181adfb4bd83ffcfadd97fe4cf814ce0e1368e..6b90d4187988cc876aa6e62a7aa8aa3a649e8ecb 100644
--- a/Source/core/html/HTMLEmbedElement.cpp
+++ b/Source/core/html/HTMLEmbedElement.cpp
@@ -214,4 +214,14 @@ 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;
+}
+
 }