Implement DataCue interface.

Source/core/html/track/DataCue.cpp

Index: Source/core/html/track/DataCue.cpp
diff --git a/Source/core/html/track/DataCue.cpp b/Source/core/html/track/DataCue.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..abd705e85464ff3e0c897a0f262b686b915b7513
--- /dev/null
+++ b/Source/core/html/track/DataCue.cpp
@@ -0,0 +1,45 @@
+// 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/DataCue.h"
+
+namespace WebCore {
+
+DataCue::DataCue(ExecutionContext* context, double startTime, double endTime, ArrayBuffer* data)
+    : TextTrackCue(startTime, endTime)
+    , ContextLifecycleObserver(context)
+{
+    ScriptWrappable::init(this);
+    setData(data);
+}
+
+DataCue::~DataCue()
+{
+}
+
+#ifndef NDEBUG
+String DataCue::toString() const
+{
+    return String::format("%p id=%s interval=%f-->%f)", this, id().utf8().data(), startTime(), endTime());
+}
+#endif
+
+PassRefPtr<ArrayBuffer> DataCue::data() const
+{
+    ASSERT(m_data);
+    return ArrayBuffer::create(m_data.get());
+}
+
+void DataCue::setData(ArrayBuffer* data)
+{
+    m_data = ArrayBuffer::create(data);
+}
+
+ExecutionContext* DataCue::executionContext() const
+{
+    return ContextLifecycleObserver::executionContext();
+}
+
+} // namespace WebCore