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

Source/core/html/HTMLFormControlElement.cpp

Index: Source/core/html/HTMLFormControlElement.cpp
diff --git a/Source/core/html/HTMLFormControlElement.cpp b/Source/core/html/HTMLFormControlElement.cpp
index 8c540e3f7c6fafd9ab9c17efd75216d38be4e7d6..3526e51947edbc61ba26f5b8826b2fe9d2bd844c 100644
--- a/Source/core/html/HTMLFormControlElement.cpp
+++ b/Source/core/html/HTMLFormControlElement.cpp
@@ -266,6 +266,25 @@ void HTMLFormControlElement::removedFrom(ContainerNode* insertionPoint)
     FormAssociatedElement::removedFrom(insertionPoint);
 }
 
+void HTMLFormControlElement::willChangeForm()
+{
+    formOwnerSetNeedsValidityCheck();
+    FormAssociatedElement::willChangeForm();
+}
+
+void HTMLFormControlElement::didChangeForm()
+{
+    formOwnerSetNeedsValidityCheck();
+    FormAssociatedElement::didChangeForm();
+}
+
+void HTMLFormControlElement::formOwnerSetNeedsValidityCheck()
+{
+    HTMLFormElement* form = formOwner();
+    if (form)
+        form->setNeedsValidityCheck();
+}
+
 void HTMLFormControlElement::setChangedSinceLastFormControlChangeEvent(bool changed)
 {
     m_wasChangedSinceLastFormControlChangeEvent = changed;
@@ -469,7 +488,7 @@ ValidationMessageClient* HTMLFormControlElement::validationMessageClient() const
 
 bool HTMLFormControlElement::checkValidity(WillBeHeapVector<RefPtrWillBeMember<FormAssociatedElement> >* unhandledInvalidControls)
 {
-    if (!willValidate() || isValidFormControlElement())
+    if (!willValidate() || isValidElement())
         return true;
     // An event handler can deref this object.
     RefPtrWillBeRawPtr<HTMLFormControlElement> protector(this);
@@ -480,7 +499,12 @@ bool HTMLFormControlElement::checkValidity(WillBeHeapVector<RefPtrWillBeMember<F
     return false;
 }
 
-bool HTMLFormControlElement::isValidFormControlElement()
+bool HTMLFormControlElement::matchesValidityPseudoClasses() const
+{
+    return willValidate();
+}
+
+bool HTMLFormControlElement::isValidElement()
 {
     // If the following assertion fails, setNeedsValidityCheck() is not called
     // correctly when something which changes validity is updated.
@@ -492,6 +516,7 @@ void HTMLFormControlElement::setNeedsValidityCheck()
 {
     bool newIsValid = valid();
     if (willValidate() && newIsValid != m_isValid) {
+        formOwnerSetNeedsValidityCheck();
         // Update style for pseudo classes such as :valid :invalid.
         setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::createWithExtraData(StyleChangeReason::PseudoClass, StyleChangeExtraData::Invalid));
     }