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

Source/core/events/DOMWindowEventQueue.h

 /*
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 class DOMWindowEventQueueTimer;
 class Node;
 class ExecutionContext;
 
 class DOMWindowEventQueue FINAL : public RefCounted<DOMWindowEventQueue>, public EventQueue {
 public:
     static PassRefPtr<DOMWindowEventQueue> create(ExecutionContext*);
     virtual ~DOMWindowEventQueue();
 
     // EventQueue
-    virtual bool enqueueEvent(PassRefPtr<Event>) OVERRIDE;
+    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) OVERRIDE;
     virtual bool cancelEvent(Event*) OVERRIDE;
     virtual void close() OVERRIDE;
 
 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;
 };
 
 }
 
 #endif // DOMWindowEventQueue_h