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diff --git a/WebCore/bindings/js/JSArrayBufferConstructor.h b/WebCore/bindings/js/JSArrayBufferConstructor.h
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+++ b/WebCore/bindings/js/JSArrayBufferConstructor.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 JSArrayBufferConstructor_h
+#define JSArrayBufferConstructor_h
+
+#include "JSDOMBinding.h"
+#include "JSDocument.h"
+#include "JSArrayBuffer.h"
+#include <runtime/Error.h>
+#include "ArrayBuffer.h"
+
+namespace WebCore {
+
+    class ArrayBufferView;
+
+    // Template function used by CanvasXXXArrayConstructors
+    template<class C, typename T>
+    PassRefPtr<ArrayBufferView> construct(JSC::ExecState* exec, const JSC::ArgList& args)
+    {
+        // There are 3 constructors:
+        //
+        //  1) (in int size)
+        //  2) (in ArrayBuffer buffer, [Optional] in int offset, [Optional] in unsigned int length)
+        //  3) (in sequence<T>) - This ends up being a JS "array-like" object
+        //
+        RefPtr<C> arrayObject;
+        
+        // For the 0 args case, just create an object without a buffer 
+        if (args.size() < 1)
+            return C::create(0, 0, 0);
+        
+        if (args.size() > 1 && !args.at(0).isObject())
+            // Invalid first argument
+            return 0;
+
+        if (args.at(0).isObject()) {
+            RefPtr<ArrayBuffer> buffer = toArrayBuffer(args.at(0));
+            if (buffer) {
+                unsigned offset = (args.size() > 1) ? args.at(1).toUInt32(exec) : 0;
+                unsigned int length = (buffer->byteLength() - offset) / sizeof(T);
+                if (args.size() > 2)
+                    length = args.at(2).toUInt32(exec);
+                return C::create(buffer, offset, length);
+            }
+            
+            JSC::JSObject* array = asObject(args.at(0));
+            unsigned length = array->get(exec, JSC::Identifier(exec, "length")).toUInt32(exec);
+            void* tempValues;
+            if (!tryFastCalloc(length, sizeof(T)).getValue(tempValues)) {
+                throwError(exec, JSC::GeneralError);
+                return 0;
+            }
+            
+            OwnFastMallocPtr<T> values(static_cast<T*>(tempValues));
+            for (unsigned i = 0; i < length; ++i) {
+                JSC::JSValue v = array->get(exec, i);
+                if (exec->hadException())
+                    return 0;
+                values.get()[i] = static_cast<T>(v.toNumber(exec));
+            }
+            
+            return C::create(values.get(), length);
+        }
+        
+        unsigned size = args.at(0).toUInt32(exec);
+        return C::create(size);
+    }
+
+    class JSArrayBufferConstructor : public DOMConstructorObject {
+    public:
+        JSArrayBufferConstructor(JSC::ExecState*, JSDOMGlobalObject*);
+        static const JSC::ClassInfo s_info;
+
+    private:
+        virtual JSC::ConstructType getConstructData(JSC::ConstructData&);
+        virtual const JSC::ClassInfo* classInfo() const { return &s_info; }
+    };
+
+}
+
+#endif // JSArrayBufferConstructor_h