Make the name of the event source for SYSLOG configurable.

base/syslog_logging.h

Index: base/syslog_logging.h
diff --git a/base/syslog_logging.h b/base/syslog_logging.h
index 0196ba7bbd86e979a3bcb52244f944797b064dfb..74f35beaf1aab86beb06d39e8d272c4a7c413ec5 100644
--- a/base/syslog_logging.h
+++ b/base/syslog_logging.h
@@ -17,6 +17,11 @@ namespace logging {
 #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 {