Generate and assign media track ids in demuxers.

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

 /*
  * Copyright (C) 2011 Apple 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 22 matching lines @@
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class HTMLMediaElement;
 
 class CORE_EXPORT TrackBase : public Supplementable<TrackBase> {
 public:
     virtual ~TrackBase();
 
-    WebMediaPlayer::TrackId trackId() const { return m_trackId; }
+    WebMediaPlayer::TrackId trackId() const { return m_id; }
 
     WebMediaPlayer::TrackType type() const { return m_type; }
 
     const AtomicString& kind() const { return m_kind; }
     AtomicString label() const { return m_label; }
     AtomicString language() const { return m_language; }
     String id() const { return m_id; }
 
     void setMediaElement(HTMLMediaElement* mediaElement) { m_mediaElement = mediaElement; }
     HTMLMediaElement* mediaElement() const { return m_mediaElement; }
     Node* owner() const;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     TrackBase(WebMediaPlayer::TrackType, const AtomicString& kind, const AtomicString& label, const AtomicString& language, const String& id);
 
-    WebMediaPlayer::TrackId m_trackId;
     WebMediaPlayer::TrackType m_type;
     AtomicString m_kind;
     AtomicString m_label;
     AtomicString m_language;
     String m_id;

[xhwang, 2016/06/09 06:06:02]

Shall this be WebMediaPlayer::TrackId m_trackId?

     Member<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