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diff --git a/Source/WebKit2/Platform/CoreIPC/DataReference.h b/Source/WebKit2/Platform/CoreIPC/DataReference.h
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+++ b/Source/WebKit2/Platform/CoreIPC/DataReference.h
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+/*
+ * Copyright (C) 2010 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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.
+ */
+
+#ifndef DataReference_h
+#define DataReference_h
+
+#include <inttypes.h>
+
+namespace CoreIPC {
+
+class ArgumentDecoder;
+class ArgumentEncoder;
+    
+class DataReference {
+public:
+    DataReference()
+        : m_data(0)
+        , m_size(0)
+    {
+    }
+
+    DataReference(const uint8_t* data, size_t size)
+        : m_data(data)
+        , m_size(size)
+    {
+    }
+
+    bool isEmpty() const { return size() == 0; }
+
+    size_t size() const { return m_size; }
+    const uint8_t* data() const 
+    { 
+        if (isEmpty())
+            return 0;
+        return m_data; 
+    }
+
+    void encode(ArgumentEncoder* encoder) const;
+    static bool decode(ArgumentDecoder* decoder, DataReference& dataReference);
+
+private:
+    const uint8_t* m_data;
+    size_t m_size;
+};
+
+} // namespace CoreIPC
+
+#endif // DataReference_h