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diff --git a/Source/WebCore/bindings/js/JSMessagePortCustom.h b/Source/WebCore/bindings/js/JSMessagePortCustom.h
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+/*
+ * Copyright (C) 2009 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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 JSMessagePortCustom_h
+#define JSMessagePortCustom_h
+
+#include "MessagePort.h"
+#include <runtime/JSValue.h>
+#include <wtf/Forward.h>
+
+namespace WebCore {
+
+    typedef int ExceptionCode;
+
+    // Helper function which pulls the values out of a JS sequence and into a MessagePortArray.
+    // Also validates the elements per sections 4.1.13 and 4.1.15 of the WebIDL spec and section 8.3.3 of the HTML5 spec.
+    // May generate an exception via the passed ExecState.
+    void fillMessagePortArray(JSC::ExecState*, JSC::JSValue, MessagePortArray&);
+
+    // Helper function to convert from JS postMessage arguments to WebCore postMessage arguments.
+    template <typename T>
+    inline JSC::JSValue handlePostMessage(JSC::ExecState* exec, T* impl)
+    {
+        PassRefPtr<SerializedScriptValue> message = SerializedScriptValue::create(exec, exec->argument(0));
+        MessagePortArray portArray;
+        fillMessagePortArray(exec, exec->argument(1), portArray);
+        if (exec->hadException())
+            return JSC::jsUndefined();
+
+        ExceptionCode ec = 0;
+        impl->postMessage(message, &portArray, ec);
+        setDOMException(exec, ec);
+        return JSC::jsUndefined();
+    }
+
+}
+#endif // JSMessagePortCustom_h