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diff --git a/Source/WebKit2/Platform/CoreIPC/MessageID.h b/Source/WebKit2/Platform/CoreIPC/MessageID.h
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+++ b/Source/WebKit2/Platform/CoreIPC/MessageID.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 MessageID_h
+#define MessageID_h
+
+namespace CoreIPC {
+
+enum MessageClass {
+    MessageClassReserved = 0,
+
+    // Messages sent by Core IPC.
+    MessageClassCoreIPC,
+
+    // Messages sent by the UI process to the web process.
+    MessageClassAuthenticationManager,
+    MessageClassDrawingArea,
+    MessageClassDrawingAreaLegacy,
+    MessageClassInjectedBundle,
+    MessageClassWebDatabaseManager,
+    MessageClassWebGeolocationManagerProxy,
+    MessageClassWebInspector,
+    MessageClassWebPage,
+    MessageClassWebProcess,
+
+    // Messages sent by the web process to the UI process.
+    MessageClassDownloadProxy,
+    MessageClassDrawingAreaProxy,
+    MessageClassDrawingAreaProxyLegacy,
+    MessageClassWebContext,
+    MessageClassWebContextLegacy,
+    MessageClassWebDatabaseManagerProxy,
+    MessageClassWebGeolocationManager,
+    MessageClassWebInspectorProxy,
+    MessageClassWebPageProxy,
+    MessageClassWebProcessProxy,
+    MessageClassWebProcessProxyLegacy,
+
+    // Messages sent by the UI process to the plug-in process.
+    MessageClassPluginProcess,
+
+    // Messages sent by the plug-in process to the UI process.
+    MessageClassPluginProcessProxy,
+
+    // Messages sent by the web process to the plug-in process.
+    MessageClassWebProcessConnection,
+    MessageClassPluginControllerProxy,
+
+    // Messages sent by the plug-in process to the web process.
+    MessageClassPluginProxy,
+
+    // NPObject messages sent by both the plug-in process and the web process.
+    MessageClassNPObjectMessageReceiver,
+};
+
+template<typename> struct MessageKindTraits { };
+
+
+/*
+    MessageID Layout (the most significant bit is reserved and therefore always zero)
+
+    ---------
+    | Flags | 7 bits
+    |-------|
+    | Class | 8 bits
+    |-------|
+    |  Msg  | 16 bits
+    |  Kind |
+    ---------
+*/
+
+class MessageID {
+public:
+    enum Flags {
+        SyncMessage = 1 << 0,
+    };
+
+    MessageID()
+        : m_messageID(0)
+    {
+    }
+
+    template <typename EnumType>
+    explicit MessageID(EnumType messageKind, unsigned char flags = 0)
+        : m_messageID(stripMostSignificantBit(flags << 24 | (MessageKindTraits<EnumType>::messageClass) << 16 | messageKind))
+    {
+    }
+
+    template <typename EnumType>
+    EnumType get() const
+    {
+        ASSERT(getClass() == MessageKindTraits<EnumType>::messageClass);
+        return static_cast<EnumType>(m_messageID & 0xffff);
+    }
+
+    template <MessageClass K>
+    bool is() const
+    {
+        return getClass() == K;
+    }
+    
+    template <typename EnumType>
+    bool operator==(EnumType messageKind) const
+    {
+        return m_messageID == MessageID(messageKind).m_messageID;
+    }
+
+    static MessageID fromInt(unsigned i)
+    {
+        MessageID messageID;
+        messageID.m_messageID = stripMostSignificantBit(i);
+        
+        return messageID;
+    }
+    
+    unsigned toInt() const { return m_messageID; }
+
+    bool isSync() const { return getFlags() & SyncMessage; }
+
+private:
+    static inline unsigned stripMostSignificantBit(unsigned value)
+    {
+        return value & 0x7fffffff;
+    }
+
+    unsigned char getFlags() const { return (m_messageID & 0xff000000) >> 24; }
+    unsigned char getClass() const { return (m_messageID & 0x00ff0000) >> 16; }
+
+    unsigned m_messageID;
+};
+
+} // namespace CoreIPC
+    
+#endif // MessageID_h