Pass MSE media track info from ChunkDemuxer to blink::SourceBuffer

third_party/WebKit/Source/core/html/track/AudioTrackList.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 AudioTrackList_h
 #define AudioTrackList_h
 
 #include "core/html/track/AudioTrack.h"
 #include "core/html/track/TrackListBase.h"
 
 namespace blink {
 
-class AudioTrackList final : public TrackListBase<AudioTrack> {
+class CORE_EXPORT AudioTrackList final : public TrackListBase<AudioTrack> {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static AudioTrackList* create(HTMLMediaElement&);
 
     ~AudioTrackList() override;
 
     bool hasEnabledTrack() const;
 
     // EventTarget
     const AtomicString& interfaceName() const override;
 
     DEFINE_INLINE_TRACE()
     {
         TrackListBase<AudioTrack>::trace(visitor);
     }
 
 private:
     explicit AudioTrackList(HTMLMediaElement&);
 };
 
 } // namespace blink
 
 #endif // AudioTrackList_h