Add support for sending protobuf messages over IPC.

chrome/common/safe_browsing/protobuf_message_read_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_READ_MACROS_H_
+#define CHROME_COMMON_SAFE_BROWSING_PROTOBUF_MESSAGE_READ_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 read 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)                        \
+  template <class P>                                                           \
+  bool ParamTraits<message_name>::ReadParamF(                                  \
+      const Message* m, PickleIterator* iter, param_type* p,                   \
+      void (param_type::*setter_function)(P)) {                                \
+    P value;                                                                   \
+    if (!ReadParam(m, iter, &value))                                           \
+      return false;                                                            \
+    (p->*setter_function)(value);                                              \
+    return true;                                                               \
+  }                                                                            \
+  bool ParamTraits<message_name>::Read(const Message* m, PickleIterator* iter, \
+                                       param_type* p) {
+#define IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_FUNDAMENTAL_MEMBER(name) \
+    {                                                                 \
+      bool is_present;                                                \
+      if (!iter->ReadBool(&is_present))                               \
+        return false;                                                 \
+      if (!is_present)                                                \
+        p->clear_##name##();                                          \

[Tom Sepez, 2015/03/16 16:45:43]

I'm not sure you can token splice onto (), p->clear_##name() should do the
trick.

[grt (UTC plus 2), 2015/03/16 17:48:13]

Done here and elsewhere.

+      else if (!ReadParamF(m, iter, p, &param_type::set_##name##))    \

[Tom Sepez, 2015/03/16 16:45:43]

ditto

+        return false;                                                 \
+    }
+#define IPC_PROTOBUF_MESSAGE_TRAITS_OPTIONAL_COMPLEX_MEMBER(name)     \
+    {                                                                 \
+      bool is_present;                                                \
+      if (!iter->ReadBool(&is_present))                               \
+        return false;                                                 \
+      if (!is_present)                                                \
+        p->clear_##name();                                            \
+      else if (!ReadParam(m, iter, p->mutable_##name##()))            \

[Tom Sepez, 2015/03/16 16:45:44]

ditto

+        return false;                                                 \
+    }
+#define IPC_PROTOBUF_MESSAGE_TRAITS_REPEATED_COMPLEX_MEMBER(name) \
+    if (!ReadParam(m, iter, p->mutable_##name()))                 \
+      return false;
+#define IPC_PROTOBUF_MESSAGE_TRAITS_END() \
+    return true;                          \
+  }
+
+#endif  // CHROME_COMMON_SAFE_BROWSING_PROTOBUF_MESSAGE_READ_MACROS_H_