Oilpan: add transition types to track interface objects.

Source/core/html/track/TrackBase.h

 /*
  * Copyright (C) 2011 Apple 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 #ifndef TrackBase_h
 #define TrackBase_h
 
+#include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
-class TrackBase : public RefCounted<TrackBase> {
+class TrackBase : public RefCountedWillBeRefCountedGarbageCollected<TrackBase> {
 public:
     virtual ~TrackBase();
 
     enum Type { TextTrack, AudioTrack, VideoTrack };
     Type type() const { return m_type; }
 
     const AtomicString& kind() const { return m_kind; }
     virtual void setKind(const AtomicString&);
 
     AtomicString label() const { return m_label; }
     void setLabel(const AtomicString& label) { m_label = label; }
 
     AtomicString language() const { return m_language; }
     void setLanguage(const AtomicString& language) { m_language = language; }
 
     AtomicString id() const { return m_id; }
     void setId(const AtomicString& id) { m_id = id; }
 
+    virtual void trace(Visitor*) { }
+
 protected:
     TrackBase(Type, const AtomicString& label, const AtomicString& language, const AtomicString& id);
 
     virtual bool isValidKind(const AtomicString&) const = 0;
     virtual AtomicString defaultKind() const = 0;
 
 private:
     Type m_type;
     AtomicString m_kind;
     AtomicString m_label;
     AtomicString m_language;
     AtomicString m_id;
 };
 
 } // namespace WebCore
 
 #endif // TrackBase_h