Implement 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * 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"
 
+#include "core/html/HTMLMediaElement.h"
+
 namespace WebCore {
 
-TrackBase::TrackBase(Type type, const AtomicString& label, const AtomicString& language, const AtomicString& id)
-    : m_type(type)
+static blink::WebMediaPlayer::TrackId nextTrackId()
+{
+    static blink::WebMediaPlayer::TrackId next = 0;
+    return ++next;
+}
+
+TrackBase::TrackBase(Type type, const AtomicString& label, const AtomicString& language, const String& id)
+    : m_trackId(nextTrackId())
+    , m_type(type)
     , m_label(label)
     , m_language(language)
     , m_id(id)
+    , m_mediaElement(nullptr)
 {
 }
 
 TrackBase::~TrackBase()
 {
+#if !ENABLE(OILPAN)
+    ASSERT(!m_mediaElement);
+#endif
+}
+
+
+Node* TrackBase::owner() const

[acolwell GONE FROM CHROMIUM, 2014/06/13 17:43:57]

nit: Is there a reason not to inline this like you did for mediaElement()?

[philipj_slow, 2014/06/14 13:51:03]

Yeah, the compiler can't cast from HTMLMediaElement* to Node* without having
seen HTMLMediaElement.h.

+{
+    return m_mediaElement;
+}
+
+void TrackBase::trace(Visitor* visitor)
+{
+    visitor->trace(m_mediaElement);
 }
 
 void TrackBase::setKind(const AtomicString& kind)
 {
     if (isValidKind(kind))
         m_kind = kind;
     else
         m_kind = defaultKind();
 }
 
 } // namespace WebCore
-