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diff --git a/Source/WebKit2/Shared/API/APIData.h b/Source/WebKit2/Shared/API/APIData.h
new file mode 100644
index 000000000..066fa441f
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+++ b/Source/WebKit2/Shared/API/APIData.h
@@ -0,0 +1,110 @@
+/*
+ * 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 APIData_h
+#define APIData_h
+
+#include "APIObject.h"
+#include "DataReference.h"
+#include <wtf/Forward.h>
+#include <wtf/Vector.h>
+
+namespace IPC {
+class Decoder;
+class Encoder;
+}
+
+OBJC_CLASS NSData;
+
+namespace API {
+
+class Data : public ObjectImpl<API::Object::Type::Data> {
+public:
+    typedef void (*FreeDataFunction)(unsigned char*, const void* context);
+
+    static Ref<Data> createWithoutCopying(const unsigned char* bytes, size_t size, FreeDataFunction freeDataFunction, const void* context)
+    {
+        return adoptRef(*new Data(bytes, size, freeDataFunction, context));
+    }
+
+    static Ref<Data> create(const unsigned char* bytes, size_t size)
+    {
+        unsigned char *copiedBytes = 0;
+
+        if (size) {
+            copiedBytes = static_cast<unsigned char*>(fastMalloc(size));
+            memcpy(copiedBytes, bytes, size);
+        }
+
+        return createWithoutCopying(copiedBytes, size, fastFreeBytes, 0);
+    }
+    
+    static Ref<Data> create(const Vector<unsigned char>& buffer)
+    {
+        return create(buffer.data(), buffer.size());
+    }
+
+#if PLATFORM(COCOA)
+    static Ref<Data> createWithoutCopying(RetainPtr<NSData>);
+#endif
+
+    ~Data()
+    {
+        m_freeDataFunction(const_cast<unsigned char*>(m_bytes), m_context);
+    }
+
+    const unsigned char* bytes() const { return m_bytes; }
+    size_t size() const { return m_size; }
+
+    IPC::DataReference dataReference() const { return IPC::DataReference(m_bytes, m_size); }
+
+    void encode(IPC::Encoder&) const;
+    static bool decode(IPC::Decoder&, RefPtr<API::Object>&);
+
+private:
+    Data(const unsigned char* bytes, size_t size, FreeDataFunction freeDataFunction, const void* context)
+        : m_bytes(bytes)
+        , m_size(size)
+        , m_freeDataFunction(freeDataFunction)
+        , m_context(context)
+    {
+    }
+
+    static void fastFreeBytes(unsigned char* bytes, const void*)
+    {
+        if (bytes)
+            fastFree(static_cast<void*>(bytes));
+    }
+
+    const unsigned char* m_bytes;
+    size_t m_size;
+
+    FreeDataFunction m_freeDataFunction;
+    const void* m_context;
+};
+
+} // namespace API
+
+#endif // APIData_h