Implement AudioTrack, AudioTrackList, VideoTrack, and VideoTrackList

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 14 matching lines @@
 
 #ifndef TrackBase_h
 #define TrackBase_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
+class HTMLMediaElement;
+
 class TrackBase : public RefCountedWillBeRefCountedGarbageCollected<TrackBase> {
 public:
     virtual ~TrackBase();
 
     enum Type { TextTrack, AudioTrack, VideoTrack };
     Type type() const { return m_type; }
 
     const AtomicString& kind() const { return m_kind; }
     virtual void setKind(const AtomicString&);
 
     AtomicString label() const { return m_label; }
     void setLabel(const AtomicString& label) { m_label = label; }
 
     AtomicString language() const { return m_language; }
     void setLanguage(const AtomicString& language) { m_language = language; }
 
-    AtomicString id() const { return m_id; }
-    void setId(const AtomicString& id) { m_id = id; }
+    String id() const { return m_id; }
+    void setId(const String& id) { m_id = id; }
+
+    void setMediaElement(HTMLMediaElement* mediaElement) { m_mediaElement = mediaElement; }
+    HTMLMediaElement* mediaElement() const { return m_mediaElement; }
 
     virtual void trace(Visitor*) { }
 
 protected:
-    TrackBase(Type, const AtomicString& label, const AtomicString& language, const AtomicString& id);
+    TrackBase(Type, const AtomicString& label, const AtomicString& language, const String& id);
 
     virtual bool isValidKind(const AtomicString&) const = 0;
     virtual AtomicString defaultKind() const = 0;
 
 private:
     Type m_type;
     AtomicString m_kind;
     AtomicString m_label;
     AtomicString m_language;
-    AtomicString m_id;
+    String m_id;
+    HTMLMediaElement* m_mediaElement;
 };
 
 } // namespace WebCore
 
 #endif // TrackBase_h