Put file_system messages in their own file and move them to content, in prepa...

content/common/common_param_traits.h

Index: content/common/common_param_traits.h
===================================================================
--- content/common/common_param_traits.h	(revision 77144)
+++ content/common/common_param_traits.h	(working copy)
@@ -14,6 +14,7 @@
 #define CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
 #pragma once
 
+#include "base/platform_file.h"
 #include "base/ref_counted.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_utils.h"
@@ -108,6 +109,19 @@
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct ParamTraits<base::PlatformFileInfo> {
+  typedef base::PlatformFileInfo param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+template <>
+struct SimilarTypeTraits<base::PlatformFileError> {
+  typedef int Type;
+};
+
 }  // namespace IPC
 
 #endif  // CONTENT_COMMON_COMMON_PARAM_TRAITS_H_