Add Element::subResourceAttributeName() virtual function

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 9ee1941f968fe5c73a022f65371379bf4567c4be..ccfe6f7222a0c6bedd241348583e993a81221587 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1071,6 +1071,11 @@ bool Element::hasLegalLinkAttribute(const QualifiedName&) const
     return false;
 }
 
+const QualifiedName* Element::subResourceAttributeName() const
+{
+    return 0;

[tkent, 2014/03/19 01:00:44]

nit: We may return WebCore::nullQName(), or we may change this function to
subResourceAttributeValue().

[Inactive, 2014/03/19 13:51:43]

Done, returning nullQName() now, one less pointer, yay.

+}
+
 inline void Element::attributeChangedFromParserOrByCloning(const QualifiedName& name, const AtomicString& newValue, AttributeModificationReason reason)
 {
     if (name == isAttr)