Implement DataCue interface.

Source/core/html/track/DataCue.h

Index: Source/core/html/track/DataCue.h
diff --git a/Source/core/html/track/DataCue.h b/Source/core/html/track/DataCue.h
new file mode 100644
index 0000000000000000000000000000000000000000..2c0f4c4a1597cefc48494082841ff572ba77b96f
--- /dev/null
+++ b/Source/core/html/track/DataCue.h
@@ -0,0 +1,47 @@
+// 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.
+
+#ifndef DataCue_h
+#define DataCue_h
+
+#include "bindings/v8/ScriptWrappable.h"
+#include "core/html/track/TextTrackCue.h"
+#include "wtf/ArrayBuffer.h"
+
+namespace WebCore {
+
+class ExecutionContext;
+
+class DataCue FINAL : public TextTrackCue, public ScriptWrappable, public ContextLifecycleObserver {
+public:
+    static PassRefPtr<DataCue> create(ExecutionContext* context, double start, double end, ArrayBuffer* data)
+    {
+        return adoptRef(new DataCue(context, start, end, data));
+    }
+
+    virtual ~DataCue();
+
+    PassRefPtr<ArrayBuffer> data() const;
+    void setData(ArrayBuffer*);
+
+    virtual CueType cueType() const OVERRIDE { return Data; }
+
+    virtual ExecutionContext* executionContext() const OVERRIDE;
+
+#ifndef NDEBUG
+    virtual String toString() const OVERRIDE;
+#endif
+
+protected:
+    DataCue(ExecutionContext*, double start, double end, ArrayBuffer*);
+
+private:
+    RefPtr<ArrayBuffer> m_data;
+};
+
+DEFINE_TYPE_CASTS(DataCue, TextTrackCue, cue, cue->cueType() == TextTrackCue::Data, cue.cueType() == TextTrackCue::Data);
+
+} // namespace WebCore
+
+#endif