Add SourceBuffer implementations of Audio/VideoTracks

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VideoTrack_h
 #define VideoTrack_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/html/track/TrackBase.h"
+#include "platform/Supplementable.h"
 
 namespace blink {
 
-class CORE_EXPORT VideoTrack final : public GarbageCollectedFinalized<VideoTrack>, public TrackBase, public ScriptWrappable {
+class CORE_EXPORT VideoTrack final : public GarbageCollectedFinalized<VideoTrack>, public TrackBase, public ScriptWrappable, public HeapSupplementable<VideoTrack> {
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(VideoTrack);
 public:
     static VideoTrack* create(const String& id, const AtomicString& kind, const AtomicString& label, const AtomicString& language, bool selected)
     {
         return new VideoTrack(id, kind, label, language, selected);
     }
 
     ~VideoTrack() override;
     DECLARE_VIRTUAL_TRACE();
@@ skipping 23 matching lines @@
     AtomicString defaultKind() const override;
 
     bool m_selected;
 };
 
 DEFINE_TRACK_TYPE_CASTS(VideoTrack, TrackBase::VideoTrack);
 
 } // namespace blink
 
 #endif // VideoTrack_h