Implementing blink side of 'invalid' AutocompleteErrorEvent#reason

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 8b333a24e80bcd0729c36f38350758542301c25e..afa5745dce47b4d0498acb1c23dd7686ab7a929f 100644
--- a/Source/core/html/HTMLFormControlElement.h
+++ b/Source/core/html/HTMLFormControlElement.h
@@ -85,10 +85,12 @@ public:
     virtual bool isActivatedSubmit() const { return false; }
     virtual void setActivatedSubmit(bool) { }
 
+    enum CheckValidityDispatchEvents { CheckValidityDispatchEventsAllowed, CheckValidityDispatchEventsNone };
+
     virtual bool willValidate() const;
     void updateVisibleValidationMessage();
     void hideVisibleValidationMessage();
-    bool checkValidity(Vector<RefPtr<FormAssociatedElement> >* unhandledInvalidControls = 0);
+    bool checkValidity(Vector<RefPtr<FormAssociatedElement> >* unhandledInvalidControls = 0, CheckValidityDispatchEvents = CheckValidityDispatchEventsAllowed);
     // This must be called when a validation constraint or control value is changed.
     void setNeedsValidityCheck();
     virtual void setCustomValidity(const String&) OVERRIDE;