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diff --git a/Source/WebKit2/Platform/CoreIPC/mac/MachPort.h b/Source/WebKit2/Platform/CoreIPC/mac/MachPort.h
new file mode 100644
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+++ b/Source/WebKit2/Platform/CoreIPC/mac/MachPort.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 MachPort_h
+#define MachPort_h
+
+#include "ArgumentDecoder.h"
+#include "ArgumentEncoder.h"
+#include "Attachment.h"
+
+namespace CoreIPC {
+
+class MachPort {
+public:
+    MachPort()
+        : m_port(MACH_PORT_NULL)
+        , m_disposition(0)
+    {
+    }
+
+    MachPort(mach_port_name_t port, mach_msg_type_name_t disposition)
+        : m_port(port)
+        , m_disposition(disposition)
+    {
+    }
+
+    void encode(ArgumentEncoder* encoder) const
+    {
+        encoder->encode(Attachment(m_port, m_disposition));
+    }
+
+    static bool decode(ArgumentDecoder* decoder, MachPort& p)
+    {
+        Attachment attachment;
+        if (!decoder->decode(attachment))
+            return false;
+        
+        p.m_port = attachment.port();
+        p.m_disposition = attachment.disposition();
+        return true;
+    }
+
+    mach_port_name_t port() const { return m_port; }
+    mach_msg_type_name_t disposition() const { return m_disposition; }
+
+private:
+    mach_port_name_t m_port;
+    mach_msg_type_name_t m_disposition;
+};
+
+} // namespace CoreIPC
+
+#endif // MachPort_h