Implement :valid and :invalid pseudoclass for <form> (resubmitting)

Source/core/dom/Element.h

Index: Source/core/dom/Element.h
diff --git a/Source/core/dom/Element.h b/Source/core/dom/Element.h
index 0b65f3f9a7bfa70bce1305ed37f6caddb9cdb04d..4c337eee5a46a8d733e854b26525898920c1bb40 100644
--- a/Source/core/dom/Element.h
+++ b/Source/core/dom/Element.h
@@ -409,6 +409,7 @@ public:
 
     virtual bool matchesReadOnlyPseudoClass() const { return false; }
     virtual bool matchesReadWritePseudoClass() const { return false; }
+    virtual bool matchesValidityPseudoClasses() const { return false; }
     bool matches(const String& selectors, ExceptionState&);
     virtual bool shouldAppearIndeterminate() const { return false; }
 
@@ -429,7 +430,7 @@ public:
     virtual bool isRequiredFormControl() const { return false; }
     virtual bool isDefaultButtonForForm() const { return false; }
     virtual bool willValidate() const { return false; }
-    virtual bool isValidFormControlElement() { return false; }
+    virtual bool isValidElement() { return false; }
     virtual bool isInRange() const { return false; }
     virtual bool isOutOfRange() const { return false; }
     virtual bool isClearButtonElement() const { return false; }