Implement AudioTrack, AudioTrackList, VideoTrack, and VideoTrackList

Source/core/html/track/VideoTrackList.cpp

+// 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)
+{
+    return adoptRefWillBeRefCountedGarbageCollected(new VideoTrackList(mediaElement));
+}
+
+VideoTrackList::~VideoTrackList()
+{
+}
+
+VideoTrackList::VideoTrackList(HTMLMediaElement& mediaElement)
+    : TrackListBase<VideoTrack>(&mediaElement)
+{
+    ScriptWrappable::init(this);
+}
+
+const AtomicString& VideoTrackList::interfaceName() const
+{
+    return EventTargetNames::VideoTrackList;
+}
+
+int VideoTrackList::selectedIndex() const
+{
+    for (unsigned i = 0; i < length(); ++i) {
+        VideoTrack* track = anonymousIndexedGetter(i);
+
+        if (track->selected())
+            return i;
+    }
+
+    return -1;
+}
+
+void VideoTrackList::trackSelected(blink::WebMediaPlayer::TrackId selectedTrackId)
+{
+    // Clear the selected flag on the previously selected track, if any.
+    for (unsigned i = 0; i < length(); ++i) {
+        VideoTrack* track = anonymousIndexedGetter(i);
+
+        if (track->trackId() != selectedTrackId)
+            track->clearSelected();
+        else
+            ASSERT(track->selected());
+    }
+
+    scheduleChangeEvent();
+}
+
+}