posix: cut down on IPC logging spew a bit

ipc/ipc_message_utils.h

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 
 #include <string>
 #include <vector>
 #include <map>
@@ skipping 735 matching lines @@
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"<XFORM>");
   }
 };
 #endif  // defined(OS_WIN)
 
 struct LogData {
   std::string channel;
   int32 routing_id;
-  uint16 type;
+  uint16 type;  // "User-defined" message type, from ipc_message.h.
   std::wstring flags;
   int64 sent;  // Time that the message was sent (i.e. at Send()).
   int64 receive;  // Time before it was dispatched (i.e. before calling
                   // OnMessageReceived).
   int64 dispatch;  // Time after it was dispatched (i.e. after calling
                    // OnMessageReceived).
   std::wstring message_name;
   std::wstring params;
 };
 
@@ skipping 466 matching lines @@
     ReplyParam p(a, b, c, d, e);
     WriteParam(reply, p);
   }
 };
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_