Adds eventlog provider dll to describe the message types of SYSLOG.

base/win/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/buildflag_header.gni")
+import("//build/win/message_compiler.gni")
 
 declare_args() {
   # Indicates if the handle verifier should operate in a single module mode. By
   # default a single instance gets shared by all the modules.
   single_module_mode_handle_verifier = false
 }
 
 # Ensure that the handle verifier is always used in a single module mode for the
 # component builds.
 if (is_component_build) {
   single_module_mode_handle_verifier = true
 }
 
 buildflag_header("base_win_features") {
   header = "base_features.h"
   header_dir = "base/win"
   flags = [ "SINGLE_MODULE_MODE_HANDLE_VERIFIER=$single_module_mode_handle_verifier" ]
 }
+
+message_compiler("eventlog_messages") {
+  visibility = [
+    "//base:base",
+    "//chrome:eventlog_provider",
+  ]
+
+  sources = [
+    "eventlog_messages.mc",
+  ]
+
+  user_mode_logging = false
+  compile_generated_code = false
+}