Initial implementation of AudioTrack, AudioTrackList, VideoTrack, and VideoTrackList.

Source/core/html/track/TrackBase.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/track/TrackBase.h"
 
 namespace WebCore {
 
-TrackBase::TrackBase(Type type, const AtomicString& label, const AtomicString& language, const AtomicString& id)
+TrackBase::TrackBase(Type type, const AtomicString& label, const AtomicString& language, const String& id)
     : m_type(type)
     , m_label(label)
     , m_language(language)
     , m_id(id)
+    , m_mediaElement(0)
 {
 }
 
 TrackBase::~TrackBase()
 {
+    ASSERT(!m_mediaElement);
 }
 
 void TrackBase::setKind(const AtomicString& kind)
 {
     if (isValidKind(kind))
         m_kind = kind;
     else
         m_kind = defaultKind();
 }
 
 } // namespace WebCore
-