Oilpan: add transition types to track interface objects.

Source/core/html/HTMLTrackElement.h

 /*
  * Copyright (C) 2011 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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLTrackElement_h
 #define HTMLTrackElement_h
 
 #include "core/html/HTMLElement.h"
 #include "core/html/track/LoadableTextTrack.h"
 #include "core/html/track/TextTrack.h"
+#include "platform/heap/Handle.h"
 
 namespace WebCore {
 
 class HTMLMediaElement;
 
 class HTMLTrackElement FINAL : public HTMLElement {
 public:
     static PassRefPtr<HTMLTrackElement> create(Document&);
 
     const AtomicString& kind();
     void setKind(const AtomicString&);
 
     enum ReadyState { NONE = 0, LOADING = 1, LOADED = 2, TRACK_ERROR = 3 };
     ReadyState readyState();
     void setReadyState(ReadyState);
 
     TextTrack* track();
 
     void scheduleLoad();
 
     enum LoadStatus { Failure, Success };
     void didCompleteLoad(LoadStatus);
 
     const AtomicString& mediaElementCrossOriginAttribute() const;
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     explicit HTMLTrackElement(Document&);
     virtual ~HTMLTrackElement();
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
 
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
 
     void loadTimerFired(Timer<HTMLTrackElement>*);
 
     HTMLMediaElement* mediaElement() const;
 
     LoadableTextTrack* ensureTrack();
     bool canLoadUrl(const KURL&);
 
-    RefPtr<LoadableTextTrack> m_track;
+    RefPtrWillBeMember<LoadableTextTrack> m_track;
     Timer<HTMLTrackElement> m_loadTimer;
 };
 
 }
 
 #endif