Add message sizing to basic IPC traits and struct macros.

ipc/param_traits_size_macros.h

Index: ipc/param_traits_size_macros.h
diff --git a/ipc/param_traits_write_macros.h b/ipc/param_traits_size_macros.h
similarity index 58%
copy from ipc/param_traits_write_macros.h
copy to ipc/param_traits_size_macros.h
index a1aca4374eb3230c3b8e72c86f73ed3deb8d941d..c05f088750a096a5cb8b87776f27c7490d6ab074 100644
--- a/ipc/param_traits_write_macros.h
+++ b/ipc/param_traits_size_macros.h
@@ -1,9 +1,9 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2016 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_WRITE_MACROS_H_
-#define IPC_PARAM_TRAITS_WRITE_MACROS_H_
+#ifndef IPC_PARAM_TRAITS_SIZE_MACROS_H_
+#define IPC_PARAM_TRAITS_SIZE_MACROS_H_
 
 // Null out all the macros that need nulling.
 #include "ipc/ipc_message_null_macros.h"
@@ -23,18 +23,18 @@
 #undef IPC_STRUCT_TRAITS_PARENT
 #undef IPC_STRUCT_TRAITS_END
 #define IPC_STRUCT_TRAITS_BEGIN(struct_name) \
-  void ParamTraits<struct_name>::Write(base::Pickle* m, const param_type& p) {
-#define IPC_STRUCT_TRAITS_MEMBER(name) WriteParam(m, p.name);
-#define IPC_STRUCT_TRAITS_PARENT(type) ParamTraits<type>::Write(m, p);
+  void ParamTraits<struct_name>::GetSize(base::PickleSizer* sizer, \
+                                         const param_type& p) {
+#define IPC_STRUCT_TRAITS_MEMBER(name) GetParamSize(sizer, p.name);
+#define IPC_STRUCT_TRAITS_PARENT(type) ParamTraits<type>::GetSize(sizer, p);
 #define IPC_STRUCT_TRAITS_END() }
 
 #undef IPC_ENUM_TRAITS_VALIDATE
 #define IPC_ENUM_TRAITS_VALIDATE(enum_name, validation_expression) \
-  void ParamTraits<enum_name>::Write(base::Pickle* m,              \
-                                     const param_type& value) {    \
-    DCHECK(validation_expression);                                 \
-    m->WriteInt(static_cast<int>(value));                          \
+  void ParamTraits<enum_name>::GetSize(base::PickleSizer* sizer,   \
+                                       const param_type& value) {  \
+    sizer->AddInt();                                               \
   }
 
-#endif  // IPC_PARAM_TRAITS_WRITE_MACROS_H_
+#endif  // IPC_PARAM_TRAITS_SIZE_MACROS_H_