use variadic macros/templates in IPC message implementation

ipc/ipc_message_utils_impl.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.
-//
-// This file contains templates forward declared (but not defined) in
-// ipc_message_utils.h so that they are only instantiated in certain files,
-// notably a few IPC unit tests.
-
-#ifndef IPC_IPC_MESSAGE_UTILS_IMPL_H_
-#define IPC_IPC_MESSAGE_UTILS_IMPL_H_
-
-namespace IPC {
-
-template <class ParamType>
-void MessageSchema<ParamType>::Write(Message* msg, const RefParam& p) {
-  WriteParam(msg, p);
-}
-
-template <class ParamType>
-bool MessageSchema<ParamType>::Read(const Message* msg, Param* p) {
-  base::PickleIterator iter(*msg);
-  if (ReadParam(msg, &iter, p))
-    return true;
-  NOTREACHED() << "Error deserializing message " << msg->type();
-  return false;
-}
-
-template <class SendParamType, class ReplyParamType>
-void SyncMessageSchema<SendParamType, ReplyParamType>::Write(
-    Message* msg,
-    const RefSendParam& send) {
-  WriteParam(msg, send);
-}
-
-template <class SendParamType, class ReplyParamType>
-bool SyncMessageSchema<SendParamType, ReplyParamType>::ReadSendParam(
-    const Message* msg, SendParam* p) {
-  base::PickleIterator iter = SyncMessage::GetDataIterator(msg);
-  return ReadParam(msg, &iter, p);
-}
-
-template <class SendParamType, class ReplyParamType>
-bool SyncMessageSchema<SendParamType, ReplyParamType>::ReadReplyParam(
-    const Message* msg, typename base::TupleTypes<ReplyParam>::ValueTuple* p) {
-  base::PickleIterator iter = SyncMessage::GetDataIterator(msg);
-  return ReadParam(msg, &iter, p);
-}
-
-}  // namespace IPC
-
-#endif  // IPC_IPC_MESSAGE_UTILS_IMPL_H_