Adds new logging type SYSLOG which logs to the system log.

base/syslog_logging.h

+// 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 BASE_SYSLOG_LOGGING_H_
+#define BASE_SYSLOG_LOGGING_H_
+
+#include "base/logging.h"
+
+namespace logging {
+
+// Keep in mind that the syslog is always active regardless of the logging level
+// and applied flags. Use only for important information that a system
+// administrator might need to maintain the browser installation.
+#define SYSLOG_STREAM(severity) \
+  COMPACT_GOOGLE_LOG_EX_ ## severity(EventLogMessage).stream()
+#define SYSLOG(severity) \
+  SYSLOG_STREAM(severity)
+
+// Creates a formatted message on the system event log. That would be the
+// Application Event log on Windows and the messages log file on POSIX systems.
+class BASE_EXPORT EventLogMessage {
+ public:
+  EventLogMessage(const char* file, int line, LogSeverity severity);
+
+  ~EventLogMessage();
+
+  std::ostream& stream() { return log_message_.stream(); }
+
+ private:
+  LogMessage log_message_;
+
+  DISALLOW_COPY_AND_ASSIGN(EventLogMessage);
+};
+
+}  // namespace logging
+
+#endif  // BASE_SYSLOG_LOGGING_H_