Add support for sending protobuf messages over IPC.

chrome/common/safe_browsing/protobuf_message_write_macros.h

+// Copyright 2015 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 CHROME_COMMON_SAFE_BROWSING_PROTOBUF_MESSAGE_WRITE_MACROS_H_
+#define CHROME_COMMON_SAFE_BROWSING_PROTOBUF_MESSAGE_WRITE_MACROS_H_
+
+// Null out all the macros that need nulling.
+#include "chrome/common/safe_browsing/ipc_protobuf_message_null_macros.h"
+
+// Set up so next include will generate write methods.
+#undef IPC_PROTOBUF_MESSAGE_TRAITS_BEGIN
+#undef IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_FUNDAMENTAL_MEMBER
+#undef IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_COMPLEX_MEMBER
+#undef IPC_PROTOBUF_MESSAGE_TRAITS_REPEATED_COMPLEX_MEMBER
+#undef IPC_PROTOBUF_MESSAGE_TRAITS_END
+
+#define IPC_PROTOBUF_MESSAGE_TRAITS_BEGIN(message_name) \
+  void ParamTraits<message_name>::Write(Message* m, const param_type& p) {
+#define IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_COMPLEX_MEMBER \
+  IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_FUNDAMENTAL_MEMBER
+#define IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_FUNDAMENTAL_MEMBER(name) \
+  if (p.has_##name()) {                                               \
+    m->WriteBool(true);                                               \
+    WriteParam(m, p.name());                                          \
+  } else {                                                            \
+    m->WriteBool(false);                                              \
+  }
+#define IPC_PROTOBUF_MESSAGE_TRAITS_REPEATED_COMPLEX_MEMBER(name) \
+  WriteParam(m, p.name());
+#define IPC_PROTOBUF_MESSAGE_TRAITS_END() }
+
+#endif  // CHROME_COMMON_SAFE_BROWSING_PROTOBUF_MESSAGE_WRITE_MACROS_H_