Add Element::subResourceAttributeName() virtual function

Source/core/html/HTMLTableRowElement.cpp

Index: Source/core/html/HTMLTableRowElement.cpp
diff --git a/Source/core/html/HTMLTableRowElement.cpp b/Source/core/html/HTMLTableRowElement.cpp
index 5dbf021877ad49c057b2b0dfb79df4c616536803..d6fd9cefc8fe7f4f2adeddf0c77c22868c22e1aa 100644
--- a/Source/core/html/HTMLTableRowElement.cpp
+++ b/Source/core/html/HTMLTableRowElement.cpp
@@ -49,6 +49,11 @@ bool HTMLTableRowElement::hasLegalLinkAttribute(const QualifiedName& name) const
     return name == backgroundAttr || HTMLTablePartElement::hasLegalLinkAttribute(name);
 }
 
+const QualifiedName& HTMLTableRowElement::subResourceAttributeName() const
+{
+    return backgroundAttr;
+}
+
 PassRefPtr<HTMLTableRowElement> HTMLTableRowElement::create(Document& document)
 {
     return adoptRef(new HTMLTableRowElement(document));