Implement AudioTrack, AudioTrackList, VideoTrack, and VideoTrackList

Source/core/html/track/TrackBase.h

Index: Source/core/html/track/TrackBase.h
diff --git a/Source/core/html/track/TrackBase.h b/Source/core/html/track/TrackBase.h
index d3625f076e5d349e4e089b20a86f5ba9e4c8b9c5..cff2b8a65629d2fda6ebc844459645e93e79635d 100644
--- a/Source/core/html/track/TrackBase.h
+++ b/Source/core/html/track/TrackBase.h
@@ -27,15 +27,20 @@
 #define TrackBase_h
 
 #include "platform/heap/Handle.h"
+#include "public/platform/WebMediaPlayer.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/AtomicString.h"
 
 namespace WebCore {
 
+class HTMLMediaElement;
+
 class TrackBase : public RefCountedWillBeRefCountedGarbageCollected<TrackBase> {
 public:
     virtual ~TrackBase();
 
+    blink::WebMediaPlayer::TrackId trackId() const { return m_trackId; }
+
     enum Type { TextTrack, AudioTrack, VideoTrack };
     Type type() const { return m_type; }
 
@@ -48,23 +53,29 @@ public:
     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; }
+    Node* owner() const;
 
-    virtual void trace(Visitor*) { }
+    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:
+    blink::WebMediaPlayer::TrackId m_trackId;
     Type m_type;
     AtomicString m_kind;
     AtomicString m_label;
     AtomicString m_language;
-    AtomicString m_id;
+    String m_id;
+    RawPtrWillBeMember<HTMLMediaElement> m_mediaElement;
 };
 
 } // namespace WebCore