Fix bug where form/fieldset :valid/:invalid won't be recalculated upon control's willValidate change

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 33f94439400cef0307050237ae35b88e057cfdb1..cb0719be95c643bc972fa6624ec6d9c0d157e9db 100644
--- a/Source/core/html/HTMLFormControlElement.h
+++ b/Source/core/html/HTMLFormControlElement.h
@@ -34,6 +34,7 @@ class HTMLFormElement;
 class ValidationMessageClient;
 
 enum CheckValidityEventBehavior { CheckValidityDispatchNoEvent, CheckValidityDispatchInvalidEvent };
+enum ValidityRecalcReason { ElementAddition, ElementRemoval, ElementModification };
 
 // HTMLFormControlElement is the default implementation of FormAssociatedElement,
 // and form-associated element implementations should use HTMLFormControlElement
@@ -142,7 +143,7 @@ protected:
     virtual void didRecalcStyle(StyleRecalcChange) override final;
 
     // This must be called any time the result of willValidate() has changed.
-    void setNeedsWillValidateCheck();
+    void setNeedsWillValidateCheck(bool = true);
     virtual bool recalcWillValidate() const;
 
     virtual void resetImpl() { }
@@ -168,7 +169,9 @@ private:
     ValidationMessageClient* validationMessageClient() const;
 
     // Requests validity recalc for the form owner, if one exists.
-    void formOwnerSetNeedsValidityCheck();
+    // In case of removal, isValid specifies element validity upon removal.
+    // In case of addition and modification, it specified new validity.
+    void formOwnerSetNeedsValidityCheck(ValidityRecalcReason, bool isValid);
     // Requests validity recalc for all ancestor fieldsets, if exist.
     void fieldSetAncestorsSetNeedsValidityCheck(Node*);