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diff --git a/Source/WebCore/html/canvas/ArrayBuffer.h b/Source/WebCore/html/canvas/ArrayBuffer.h
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+++ b/Source/WebCore/html/canvas/ArrayBuffer.h
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+/*
+ * Copyright (C) 2009 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. 
+ */
+
+#ifndef ArrayBuffer_h
+#define ArrayBuffer_h
+
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class ArrayBuffer : public RefCounted<ArrayBuffer> {
+  public:
+    static PassRefPtr<ArrayBuffer> create(unsigned numElements, unsigned elementByteSize);
+    static PassRefPtr<ArrayBuffer> create(ArrayBuffer*);
+    static PassRefPtr<ArrayBuffer> create(void* source, unsigned byteLength);
+
+    void* data();
+    const void* data() const;
+    unsigned byteLength() const;
+
+    ~ArrayBuffer();
+
+  private:
+    ArrayBuffer(void* data, unsigned sizeInBytes);
+    ArrayBuffer(unsigned numElements, unsigned elementByteSize);
+    static void* tryAllocate(unsigned numElements, unsigned elementByteSize);
+    unsigned m_sizeInBytes;
+    void* m_data;
+};
+
+} // namespace WebCore
+
+#endif // ArrayBuffer_h