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 cb1fe1d71ec64eacda0d67bb077300b1257faf3d..0af7cd3c8b04d34b5db2723133e2e6e1d0db5fa2 100644
--- a/Source/core/html/HTMLEmbedElement.cpp
+++ b/Source/core/html/HTMLEmbedElement.cpp
@@ -211,4 +211,14 @@ 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;
+}
+
 }