Make PlatformFileForTransit its own class on Windows.

ipc/ipc_message_utils.h

 // Copyright (c) 2012 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 <limits.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 31 matching lines @@
 class TimeDelta;
 class TimeTicks;
 class UnguessableToken;
 struct FileDescriptor;
 }
 
 namespace IPC {
 
 struct ChannelHandle;
 
+#if defined(OS_WIN)
+class PlatformFileForTransit;
+#endif
+
 // -----------------------------------------------------------------------------
 // How we send IPC message logs across channels.
 struct IPC_EXPORT LogData {
   LogData();
   LogData(const LogData& other);
   ~LogData();
 
   std::string channel;
   int32_t routing_id;
   uint32_t type;  // "User-defined" message type, from ipc_message.h.
@@ skipping 524 matching lines @@
 struct IPC_EXPORT ParamTraits<base::SharedMemoryHandle> {
   typedef base::SharedMemoryHandle param_type;
   static void GetSize(base::PickleSizer* sizer, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
                    param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
+#if defined(OS_WIN)
+template <>
+struct IPC_EXPORT ParamTraits<PlatformFileForTransit> {
+  typedef PlatformFileForTransit param_type;
+  static void GetSize(base::PickleSizer* sizer, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+#endif  // defined(OS_WIN)
+
 template <>
 struct IPC_EXPORT ParamTraits<base::FilePath> {
   typedef base::FilePath param_type;
   static void GetSize(base::PickleSizer* sizer, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
                    param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
@@ skipping 573 matching lines @@
 template <class ReplyParamType>
 inline void LogReplyParamsToMessage(const ReplyParamType& reply_params,
                                     const Message* msg) {}
 
 inline void ConnectMessageAndReply(const Message* msg, Message* reply) {}
 #endif
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_