Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/events/EventListenerMap.cpp

Index: sky/engine/core/events/EventListenerMap.cpp
diff --git a/sky/engine/core/events/EventListenerMap.cpp b/sky/engine/core/events/EventListenerMap.cpp
index 3677a32b7dbdb4c6e4d6e7775b97edc11b5251d2..d6a541b7143bf2d013150e8de006087a2cbe59db 100644
--- a/sky/engine/core/events/EventListenerMap.cpp
+++ b/sky/engine/core/events/EventListenerMap.cpp
@@ -176,13 +176,13 @@ EventListenerIterator::EventListenerIterator()
 {
 }
 
-EventListenerIterator::EventListenerIterator(EventTarget* target)
+EventListenerIterator::EventListenerIterator(const EventTarget* target)
     : m_map(0)
     , m_entryIndex(0)
     , m_index(0)
 {
     ASSERT(target);
-    EventTargetData* data = target->eventTargetData();
+    EventTargetData* data = const_cast<EventTarget*>(target)->eventTargetData();
 
     if (!data)
         return;