Add Element::subResourceAttributeName() virtual function

Source/core/html/HTMLObjectElement.cpp

Index: Source/core/html/HTMLObjectElement.cpp
diff --git a/Source/core/html/HTMLObjectElement.cpp b/Source/core/html/HTMLObjectElement.cpp
index 4c81b74b9a6640bf7a4dbd297692417458573d4c..f3e473b71d1638fdb04746fe80fa13f886f1b80b 100644
--- a/Source/core/html/HTMLObjectElement.cpp
+++ b/Source/core/html/HTMLObjectElement.cpp
@@ -375,6 +375,11 @@ bool HTMLObjectElement::hasLegalLinkAttribute(const QualifiedName& name) const
     return name == classidAttr || name == dataAttr || name == codebaseAttr || HTMLPlugInElement::hasLegalLinkAttribute(name);
 }
 
+const QualifiedName& HTMLObjectElement::subResourceAttributeName() const
+{
+    return dataAttr;
+}
+
 const AtomicString HTMLObjectElement::imageSourceURL() const
 {
     return getAttribute(dataAttr);