Implementing blink side of 'invalid' AutocompleteErrorEvent#reason

Source/core/html/HTMLFormElement.h

Index: Source/core/html/HTMLFormElement.h
diff --git a/Source/core/html/HTMLFormElement.h b/Source/core/html/HTMLFormElement.h
index dc0b5270599e59932c620d98e5899f7c83e65b6d..84b86048d9a355a6b60184371bd4e3510fcb74d7 100644
--- a/Source/core/html/HTMLFormElement.h
+++ b/Source/core/html/HTMLFormElement.h
@@ -26,6 +26,7 @@
 
 #include "core/dom/CheckedRadioButtons.h"
 #include "core/html/HTMLElement.h"
+#include "core/html/HTMLFormControlElement.h"
 #include "core/loader/FormState.h"
 #include "core/loader/FormSubmission.h"
 #include <wtf/OwnPtr.h>
@@ -100,6 +101,7 @@ public:
     HTMLFormControlElement* defaultButton() const;
 
     bool checkValidity();
+    bool checkValidityWithoutDispatchingEvents();
 
     enum AutocompleteResult {
         AutocompleteResultSuccess,
@@ -153,7 +155,7 @@ private:
     // Validates each of the controls, and stores controls of which 'invalid'
     // event was not canceled to the specified vector. Returns true if there
     // are any invalid controls in this form.
-    bool checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<FormAssociatedElement> >&);
+    bool checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<FormAssociatedElement> >*, HTMLFormControlElement::CheckValidityDispatchEvents = HTMLFormControlElement::CheckValidityDispatchEventsAllowed);
 
     typedef HashMap<RefPtr<AtomicStringImpl>, RefPtr<HTMLFormControlElement> > AliasMap;