Create a message filter for message port messages. This allows a nice cleanu...

ipc/ipc_message.h

Index: ipc/ipc_message.h
===================================================================
--- ipc/ipc_message.h	(revision 69724)
+++ ipc/ipc_message.h	(working copy)
@@ -130,27 +130,29 @@
     header()->routing = new_id;
   }
 
-  template<class T>
-  static bool Dispatch(const Message* msg, T* obj, void (T::*func)()) {
+  template<class T, class S>
+  static bool Dispatch(const Message* msg, T* obj, S* sender,
+                       void (T::*func)()) {
     (obj->*func)();
     return true;
   }
 
-  template<class T>
-  static bool Dispatch(const Message* msg, T* obj, void (T::*func)() const) {
+  template<class T, class S>
+  static bool Dispatch(const Message* msg, T* obj, S* sender,
+                       void (T::*func)() const) {
     (obj->*func)();
     return true;
   }
 
-  template<class T>
-  static bool Dispatch(const Message* msg, T* obj,
+  template<class T, class S>
+  static bool Dispatch(const Message* msg, T* obj, S* sender,
                        void (T::*func)(const Message&)) {
     (obj->*func)(*msg);
     return true;
   }
 
-  template<class T>
-  static bool Dispatch(const Message* msg, T* obj,
+  template<class T, class S>
+  static bool Dispatch(const Message* msg, T* obj, S* sender,
                        void (T::*func)(const Message&) const) {
     (obj->*func)(*msg);
     return true;