Implement 'mouseenter' and 'mouseleave' from DOM Level 3 Events.

Source/core/dom/EventListenerMap.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>
  * Copyright (C) 2011 Andreas Kling (kling@webkit.org)
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 57 matching lines @@
 
 bool EventListenerMap::contains(const AtomicString& eventType) const
 {
     for (unsigned i = 0; i < m_entries.size(); ++i) {
         if (m_entries[i].first == eventType)
             return true;
     }
     return false;
 }
 
+bool EventListenerMap::containsCapturing(const AtomicString& eventType) const
+{
+    for (unsigned i = 0; i < m_entries.size(); ++i) {
+        if (m_entries[i].first == eventType) {
+            const EventListenerVector* vector = m_entries[i].second.get();
+            for (unsigned j = 0; j < vector->size(); ++j) {
+                if (vector->at(j).useCapture)
+                    return true;
+            }
+        }

[esprehn, 2013/07/10 02:13:56]

This is identical to:

const EventListenerVector* vector = find(eventType);
for (unsigned j = 0; j < vector->size(); ++j) {
  if (vector[j].useCapture)
     return true;
}
return false;

similarly contains() is identical to:

return find(eventType);

You don't need to simplify contains() in this patch though.

+    }
+    return false;
+}
+
 void EventListenerMap::clear()
 {
     assertNoActiveIterators();
 
     m_entries.clear();
 }
 
 Vector<AtomicString> EventListenerMap::eventTypes() const
 {
     Vector<AtomicString> types;
@@ skipping 161 matching lines @@
         EventListenerVector& listeners = *m_map->m_entries[m_entryIndex].second;
         if (m_index < listeners.size())
             return listeners[m_index++].listener.get();
         m_index = 0;
     }
 
     return 0;
 }
 
 } // namespace WebCore