Make the name of the event source for SYSLOG configurable.

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)
 
+// Sets the name of the event source for logging to the Windows Event Log.
+// Call this function once before using the SYSLOG macro or otherwise it will
+// behave as a regular LOG macro.
+void BASE_EXPORT SetEventSourceName(const std::string& name);
+
 // 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_