Oilpan: add transition types to track interface objects.

Source/core/html/track/LoadableTextTrack.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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (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 LoadableTextTrack_h
 #define LoadableTextTrack_h
 
 #include "core/html/track/TextTrack.h"
 #include "core/loader/TextTrackLoader.h"
+#include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
 class HTMLTrackElement;
 class LoadableTextTrack;
 
 class LoadableTextTrack FINAL : public TextTrack, private TextTrackLoaderClient {
 public:
-    static PassRefPtr<LoadableTextTrack> create(HTMLTrackElement* track)
+    static PassRefPtrWillBeRawPtr<LoadableTextTrack> create(HTMLTrackElement* track)
     {
-        return adoptRef(new LoadableTextTrack(track));
+        return adoptRefWillBeRefCountedGarbageCollected(new LoadableTextTrack(track));
     }
     virtual ~LoadableTextTrack();
 
     void scheduleLoad(const KURL&);
 
     // TextTrack method.
     virtual void setMode(const AtomicString&) OVERRIDE;
 
     size_t trackElementIndex();
     HTMLTrackElement* trackElement() { return m_trackElement; }
     void clearTrackElement();
 
     virtual bool isDefault() const OVERRIDE { return m_isDefault; }
     virtual void setIsDefault(bool isDefault) OVERRIDE  { m_isDefault = isDefault; }
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 private:
     // TextTrackLoaderClient
     virtual void newCuesAvailable(TextTrackLoader*) OVERRIDE;
     virtual void cueLoadingCompleted(TextTrackLoader*, bool loadingFailed) OVERRIDE;
     virtual void newRegionsAvailable(TextTrackLoader*) OVERRIDE;
 
     LoadableTextTrack(HTMLTrackElement*);
 
     void loadTimerFired(Timer<LoadableTextTrack>*);
 
     HTMLTrackElement* m_trackElement;

[haraken, 2014/04/22 02:37:47]

This raw pointer looks safe because it's cleared in clearTrackElement() when the
track element dies.

     Timer<LoadableTextTrack> m_loadTimer;
-    OwnPtr<TextTrackLoader> m_loader;
+    OwnPtrWillBeMember<TextTrackLoader> m_loader;
     KURL m_url;
     bool m_isDefault;
 };
 } // namespace WebCore
 
 #endif