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..b0bb55f0847f89a81e9668de8dc8735bc993cd26 100644
--- a/Source/core/html/HTMLFormControlElement.h
+++ b/Source/core/html/HTMLFormControlElement.h
@@ -85,6 +85,7 @@ public:
     virtual void setActivatedSubmit(bool) { }
 
     virtual bool willValidate() const OVERRIDE;
+
     void updateVisibleValidationMessage();
     void hideVisibleValidationMessage();
     bool checkValidity(WillBeHeapVector<RefPtrWillBeMember<FormAssociatedElement> >* unhandledInvalidControls = 0);
@@ -121,6 +122,8 @@ protected:
     virtual void attach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
+    virtual void willChangeForm() OVERRIDE;
+    virtual void didChangeForm() OVERRIDE;
     virtual void didMoveToNewDocument(Document& oldDocument) OVERRIDE;
 
     virtual bool supportsFocus() const OVERRIDE;
@@ -152,12 +155,15 @@ private:
     virtual short tabIndex() const OVERRIDE FINAL;
 
     virtual bool isDefaultButtonForForm() const OVERRIDE FINAL;
-    virtual bool isValidFormControlElement() OVERRIDE FINAL;
+    virtual bool isValidElement() OVERRIDE FINAL;
     void updateAncestorDisabledState() const;
 
     bool isValidationMessageVisible() const;
     ValidationMessageClient* validationMessageClient() const;
 
+    // Requests validity recalc for the form owner, if one exists.
+    void formOwnerSetNeedsValidityCheck();
+
     bool m_disabled : 1;
     bool m_isAutofilled : 1;
     bool m_isReadOnly : 1;