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diff --git a/Source/WebCore/html/track/InbandDataTextTrack.cpp b/Source/WebCore/html/track/InbandDataTextTrack.cpp
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index 000000000..d2d4a01dc
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+++ b/Source/WebCore/html/track/InbandDataTextTrack.cpp
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+/*
+ * Copyright (C) 2014 Cable Television Labs Inc.  All rights reserved.
+ * Copyright (C) 2014-2017 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 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 "InbandDataTextTrack.h"
+
+#if ENABLE(VIDEO_TRACK)
+
+#include "DataCue.h"
+#include "HTMLMediaElement.h"
+#include "InbandTextTrackPrivate.h"
+#include "Logging.h"
+
+namespace WebCore {
+
+inline InbandDataTextTrack::InbandDataTextTrack(ScriptExecutionContext& context, TextTrackClient& client, InbandTextTrackPrivate& trackPrivate)
+    : InbandTextTrack(context, client, trackPrivate)
+{
+}
+
+Ref<InbandDataTextTrack> InbandDataTextTrack::create(ScriptExecutionContext& context, TextTrackClient& client, InbandTextTrackPrivate& trackPrivate)
+{
+    return adoptRef(*new InbandDataTextTrack(context, client, trackPrivate));
+}
+
+InbandDataTextTrack::~InbandDataTextTrack()
+{
+}
+
+void InbandDataTextTrack::addDataCue(const MediaTime& start, const MediaTime& end, const void* data, unsigned length)
+{
+    addCue(DataCue::create(*scriptExecutionContext(), start, end, data, length));
+}
+
+#if ENABLE(DATACUE_VALUE)
+
+void InbandDataTextTrack::addDataCue(const MediaTime& start, const MediaTime& end, Ref<SerializedPlatformRepresentation>&& platformValue, const String& type)
+{
+    if (m_incompleteCueMap.contains(platformValue.ptr()))
+        return;
+
+    auto cue = DataCue::create(*scriptExecutionContext(), start, end, platformValue.copyRef(), type);
+    if (hasCue(cue.ptr(), TextTrackCue::IgnoreDuration)) {
+        LOG(Media, "InbandDataTextTrack::addDataCue ignoring already added cue: start=%s, end=%s\n", toString(cue->startTime()).utf8().data(), toString(cue->endTime()).utf8().data());
+        return;
+    }
+
+    if (end.isPositiveInfinite() && mediaElement()) {
+        cue->setEndTime(mediaElement()->durationMediaTime());
+        m_incompleteCueMap.add(WTFMove(platformValue), cue.copyRef());
+    }
+
+    addCue(WTFMove(cue));
+}
+
+void InbandDataTextTrack::updateDataCue(const MediaTime& start, const MediaTime& inEnd, SerializedPlatformRepresentation& platformValue)
+{
+    RefPtr<DataCue> cue = m_incompleteCueMap.get(&platformValue);
+    if (!cue)
+        return;
+
+    cue->willChange();
+
+    MediaTime end = inEnd;
+    if (end.isPositiveInfinite() && mediaElement())
+        end = mediaElement()->durationMediaTime();
+    else
+        m_incompleteCueMap.remove(&platformValue);
+
+    LOG(Media, "InbandDataTextTrack::updateDataCue: was start=%s, end=%s, will be start=%s, end=%s\n", toString(cue->startTime()).utf8().data(), toString(cue->endTime()).utf8().data(), toString(start).utf8().data(), toString(end).utf8().data());
+
+    cue->setStartTime(start);
+    cue->setEndTime(end);
+
+    cue->didChange();
+}
+
+void InbandDataTextTrack::removeDataCue(const MediaTime&, const MediaTime&, SerializedPlatformRepresentation& platformValue)
+{
+    if (auto cue = m_incompleteCueMap.take(&platformValue)) {
+        LOG(Media, "InbandDataTextTrack::removeDataCue removing cue: start=%s, end=%s\n", toString(cue->startTime()).utf8().data(), toString(cue->endTime()).utf8().data());
+        InbandTextTrack::removeCue(*cue);
+    }
+}
+
+ExceptionOr<void> InbandDataTextTrack::removeCue(TextTrackCue& cue)
+{
+    ASSERT(cue.cueType() == TextTrackCue::Data);
+
+    m_incompleteCueMap.remove(const_cast<SerializedPlatformRepresentation*>(toDataCue(&cue)->platformValue()));
+
+    return InbandTextTrack::removeCue(cue);
+}
+
+#endif
+
+} // namespace WebCore
+
+#endif