Make the implementation .cc files go away, instead have the authors give us a...

ipc/param_traits_read_macros.h

+// Copyright (c) 2011 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_PARAM_TRAITS_READ_MACROS_H_
+#define IPC_PARAM_TRAITS_READ_MACROS_H_
+
+// Null out all the macros that need nulling.
+#include "ipc/ipc_message_null_macros.h"
+
+// STRUCT declarations cause corresponding STRUCT_TRAITS declarations to occur.
+#undef IPC_STRUCT_BEGIN
+#undef IPC_STRUCT_MEMBER
+#undef IPC_STRUCT_END
+#define IPC_STRUCT_BEGIN(struct_name) IPC_STRUCT_TRAITS_BEGIN(struct_name)
+#define IPC_STRUCT_MEMBER(type, name) IPC_STRUCT_TRAITS_MEMBER(name)
+#define IPC_STRUCT_END() IPC_STRUCT_TRAITS_END()
+
+// Set up so next include will generate read methods.
+#undef IPC_STRUCT_TRAITS_BEGIN
+#undef IPC_STRUCT_TRAITS_MEMBER
+#undef IPC_STRUCT_TRAITS_END
+#define IPC_STRUCT_TRAITS_BEGIN(struct_name) \
+  bool ParamTraits<struct_name>:: \
+      Read(const Message* m, void** iter, param_type* p) { \
+    return
+#define IPC_STRUCT_TRAITS_MEMBER(name) ReadParam(m, iter, &p->name) &&
+#define IPC_STRUCT_TRAITS_END() 1; }
+
+#undef IPC_ENUM_TRAITS
+#define IPC_ENUM_TRAITS(enum_name) \
+  bool ParamTraits<enum_name>:: \
+      Read(const Message* m, void** iter, param_type* p) { \
+    int type; \
+    if (!m->ReadInt(iter, &type)) \
+      return false; \
+    *p = static_cast<param_type>(type); \
+    return true; \
+  }
+
+#endif  // IPC_PARAM_TRAITS_READ_MACROS_H_
+