Implementing blink side of 'invalid' AutocompleteErrorEvent#reason

public/web/WebFormElement.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 50 matching lines @@
 
         WEBKIT_EXPORT bool autoComplete() const;
         WEBKIT_EXPORT WebString action() const;
         WEBKIT_EXPORT WebString name() const;
         WEBKIT_EXPORT WebString method() const;
         WEBKIT_EXPORT bool wasUserSubmitted() const;
         WEBKIT_EXPORT void submit();
         // FIXME: Deprecate and replace with WebVector<WebElement>.
         WEBKIT_EXPORT void getNamedElements(const WebString&, WebVector<WebNode>&);
         WEBKIT_EXPORT void getFormControlElements(WebVector<WebFormControlElement>&) const;
+        WEBKIT_EXPORT bool checkValidityWithoutDispatchingEvents();
 
         enum AutocompleteResult {
             AutocompleteResultSuccess,
             AutocompleteResultErrorDisabled,
             AutocompleteResultErrorCancel,
             AutocompleteResultErrorInvalid,
         };
         WEBKIT_EXPORT void finishRequestAutocomplete(WebFormElement::AutocompleteResult);
 
 #if WEBKIT_IMPLEMENTATION
         WebFormElement(const WTF::PassRefPtr<WebCore::HTMLFormElement>&);
         WebFormElement& operator=(const WTF::PassRefPtr<WebCore::HTMLFormElement>&);
         operator WTF::PassRefPtr<WebCore::HTMLFormElement>() const;
 #endif
     };
 
 } // namespace WebKit
 
 #endif