Add support for DOM Level 3 WheelEvent

Source/core/dom/EventTarget.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 158 matching lines @@
     event->setEventPhase(Event::AT_TARGET);
     bool defaultPrevented = fireEventListeners(event.get());
     event->setEventPhase(0);
     return defaultPrevented;
 }
 
 void EventTarget::uncaughtExceptionInEventHandler()
 {
 }
 
 static AtomicString prefixedType(const Event* event)

[arv (Not doing code reviews), 2013/08/16 18:37:45]

This might be better named as legacyType now?

 {
     if (event->type() == eventNames().transitionendEvent)
         return eventNames().webkitTransitionEndEvent;
 
+    if (event->type() == eventNames().wheelEvent)
+        return eventNames().mousewheelEvent;
+
     return emptyString();
 }
 
 bool EventTarget::fireEventListeners(Event* event)
 {
     ASSERT(!NoEventDispatchAssertion::isEventDispatchForbidden());
     ASSERT(event && !event->type().isEmpty());
 
     EventTargetData* d = eventTargetData();
     if (!d)
         return true;
 
     EventListenerVector* listenerPrefixedVector = 0;
     AtomicString prefixedTypeName = prefixedType(event);

[arv (Not doing code reviews), 2013/08/16 18:37:45]

AtomicString legacyTypeName = legacyType(event);

here too then.

     if (!prefixedTypeName.isEmpty())
         listenerPrefixedVector = d->eventListenerMap.find(prefixedTypeName);
 
     EventListenerVector* listenerUnprefixedVector = d->eventListenerMap.find(event->type());
 
     if (listenerUnprefixedVector)
         fireEventListeners(event, d, *listenerUnprefixedVector);
     else if (listenerPrefixedVector) {
         AtomicString unprefixedTypeName = event->type();
         event->setType(prefixedTypeName);
         fireEventListeners(event, d, *listenerPrefixedVector);
         event->setType(unprefixedTypeName);
     }
 
-    if (!prefixedTypeName.isEmpty()) {
+    if (prefixedTypeName == eventNames().webkitTransitionEndEvent) {
         if (DOMWindow* executingWindow = this->executingWindow()) {
             if (listenerPrefixedVector) {
                 if (listenerUnprefixedVector)
                     UseCounter::count(executingWindow, UseCounter::PrefixedAndUnprefixedTransitionEndEvent);
                 else
                     UseCounter::count(executingWindow, UseCounter::PrefixedTransitionEndEvent);
             } else if (listenerUnprefixedVector) {
                 UseCounter::count(executingWindow, UseCounter::UnprefixedTransitionEndEvent);
             }
         }
@@ skipping 79 matching lines @@
     // they have one less listener to invoke.
     if (d->firingEventIterators) {
         for (size_t i = 0; i < d->firingEventIterators->size(); ++i) {
             d->firingEventIterators->at(i).iterator = 0;
             d->firingEventIterators->at(i).end = 0;
         }
     }
 }
 
 } // namespace WebCore