Add SourceBuffer implementations of Audio/VideoTracks

third_party/WebKit/Source/core/html/track/TrackBase.h

 /*
  * Copyright (C) 2011 Apple Inc.  All rights reserved.
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 #ifndef TrackBase_h
 #define TrackBase_h
 
 #include "core/CoreExport.h"
+#include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebMediaPlayer.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class HTMLMediaElement;
 
-class CORE_EXPORT TrackBase : public GarbageCollectedMixin {
+class CORE_EXPORT TrackBase : public HeapSupplementable<TrackBase> {
 public:
     virtual ~TrackBase();
 
     WebMediaPlayer::TrackId trackId() const { return m_trackId; }
 
     WebMediaPlayer::TrackType type() const { return m_type; }
 
     const AtomicString& kind() const { return m_kind; }
     virtual void setKind(const AtomicString&);
 
@@ skipping 27 matching lines @@
     String m_id;
     RawPtrWillBeMember<HTMLMediaElement> m_mediaElement;
 };
 
 #define DEFINE_TRACK_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, TrackBase, track, track->type() == predicate, track.type() == predicate)
 
 } // namespace blink
 
 #endif // TrackBase_h