Implement :valid and :invalid pseudoclass for <form>

Source/core/html/HTMLFormControlElement.h

Index: Source/core/html/HTMLFormControlElement.h
diff --git a/Source/core/html/HTMLFormControlElement.h b/Source/core/html/HTMLFormControlElement.h
index 525ef0d254e12c52b10a70dae5ebce82553879fd..b2edf3935517fae239f7308e6d3fb645de354bd3 100644
--- a/Source/core/html/HTMLFormControlElement.h
+++ b/Source/core/html/HTMLFormControlElement.h
@@ -85,6 +85,8 @@ public:
     virtual void setActivatedSubmit(bool) { }
 
     virtual bool willValidate() const OVERRIDE;
+    virtual bool isValidElement() OVERRIDE FINAL;
+
     void updateVisibleValidationMessage();
     void hideVisibleValidationMessage();
     bool checkValidity(WillBeHeapVector<RefPtrWillBeMember<FormAssociatedElement> >* unhandledInvalidControls = 0);
@@ -152,12 +154,14 @@ private:
     virtual short tabIndex() const OVERRIDE FINAL;
 
     virtual bool isDefaultButtonForForm() const OVERRIDE FINAL;
-    virtual bool isValidFormControlElement() OVERRIDE FINAL;
     void updateAncestorDisabledState() const;
 
     bool isValidationMessageVisible() const;
     ValidationMessageClient* validationMessageClient() const;
 
+    // Requests style reculc for the form owner, if one exists.
+    void setFormOwnerNeedsStyleRecalc();
+
     bool m_disabled : 1;
     bool m_isAutofilled : 1;
     bool m_isReadOnly : 1;