Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/events/DOMWindowEventQueue.h

Index: Source/core/events/DOMWindowEventQueue.h
diff --git a/Source/core/events/DOMWindowEventQueue.h b/Source/core/events/DOMWindowEventQueue.h
index 23dbb932fef1d61862b2244e6e26a9c640ce7f62..dca7dedd63fb3d359bc5e0629a1376e3933cac3d 100644
--- a/Source/core/events/DOMWindowEventQueue.h
+++ b/Source/core/events/DOMWindowEventQueue.h
@@ -47,7 +47,7 @@ public:
     virtual ~DOMWindowEventQueue();
 
     // EventQueue
-    virtual bool enqueueEvent(PassRefPtr<Event>) OVERRIDE;
+    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) OVERRIDE;
     virtual bool cancelEvent(Event*) OVERRIDE;
     virtual void close() OVERRIDE;
 
@@ -55,10 +55,11 @@ private:
     explicit DOMWindowEventQueue(ExecutionContext*);
 
     void pendingEventTimerFired();
-    void dispatchEvent(PassRefPtr<Event>);
+    void dispatchEvent(PassRefPtrWillBeRawPtr<Event>);
 
     OwnPtr<DOMWindowEventQueueTimer> m_pendingEventTimer;
-    ListHashSet<RefPtr<Event>, 16> m_queuedEvents;
+    // FIXME: oilpan: This should be HeapListHashSet once it's implemented.
+    ListHashSet<RefPtrWillBePersistent<Event>, 16> m_queuedEvents;

[tkent, 2014/04/02 06:22:01]

Does it work well even if rehash() happens?  If Persistent objects were copied
with memcpy or something, the persistent list would break.

[haraken, 2014/04/02 06:28:00]

Erik: Do you have any idea on this?

[Mads Ager (chromium), 2014/04/02 06:31:46]

Yes, this works. For HashMaps, HashSets, ListHashSets objects are always
constructed and destructed. (Which means that a rehashing of a set of RefPtrs
will increment and decrement the ref count for every move.)

That said, we should get the ListHashSet supported on heap ASAP.

     bool m_isClosed;
 
     friend class DOMWindowEventQueueTimer;