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

Source/core/html/track/VideoTrackList.cpp

Index: Source/core/html/track/VideoTrackList.cpp
diff --git a/Source/core/html/track/VideoTrackList.cpp b/Source/core/html/track/VideoTrackList.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..23749202a58b0ef0f4847d84376a472cce52927c
--- /dev/null
+++ b/Source/core/html/track/VideoTrackList.cpp
@@ -0,0 +1,70 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/html/track/VideoTrackList.h"
+
+#include "core/html/HTMLMediaElement.h"
+#include "core/html/track/VideoTrack.h"
+
+namespace WebCore {
+
+PassRefPtrWillBeRawPtr<VideoTrackList> VideoTrackList::create(HTMLMediaElement* mediaElement)
+{
+    RefPtrWillBeRawPtr<VideoTrackList> trackList(adoptRefWillBeRefCountedGarbageCollected(new VideoTrackList(mediaElement)));
+    trackList->suspendIfNeeded();
+    return trackList.release();
+}
+
+VideoTrackList::~VideoTrackList()
+{
+}
+
+VideoTrackList::VideoTrackList(HTMLMediaElement* mediaElement)
+    : TrackBaseList(mediaElement)
+    , m_selectedIndex(-1)
+{
+    ScriptWrappable::init(this);
+}
+
+VideoTrack* VideoTrackList::anonymousIndexedGetter(unsigned index) const
+{
+    return static_cast<VideoTrack*>(getByIndex(index));
+}
+
+VideoTrack* VideoTrackList::getTrackById(const AtomicString& id) const
+{
+    return static_cast<VideoTrack*>(getById(id));
+}
+
+const AtomicString& VideoTrackList::interfaceName() const
+{
+    return EventTargetNames::VideoTrackList;
+}
+
+void VideoTrackList::trackSelected(const AtomicString& selectedTrackID)
+{
+
+    bool scheduleEvent = false;
+    if (m_selectedIndex != -1) {
+        VideoTrack* oldTrack = anonymousIndexedGetter(m_selectedIndex);
+
+        ASSERT(oldTrack->id() != selectedTrackID);
+
+        oldTrack->clearSelected();
+        scheduleEvent = true;
+    }
+
+    if (selectedTrackID.isEmpty()) {
+        m_selectedIndex = -1;
+    } else {
+        m_selectedIndex = getIndex(selectedTrackID);
+        scheduleEvent = true;
+    }
+
+    if (scheduleEvent)
+        scheduleChangeEvent();
+}
+
+}