Make the name of the event source for SYSLOG configurable.

base/syslog_logging.cc

Index: base/syslog_logging.cc
diff --git a/base/syslog_logging.cc b/base/syslog_logging.cc
index 1cd545910a967a6f52f5a138136bceb8be6782fd..0e8308d7b579ab743d492232e4309edb7ea9602d 100644
--- a/base/syslog_logging.cc
+++ b/base/syslog_logging.cc
@@ -19,6 +19,18 @@
 
 namespace logging {
 
+#if defined(OS_WIN)
+
+namespace {
+std::string* g_event_source_name = nullptr;
+}
+
+void SetEventSourceName(const std::string& name) {
+  DCHECK(g_event_source_name == nullptr);

[grt (UTC plus 2), 2016/11/28 12:49:52]

nit: DCHECK_EQ(g_event_source_name, nullptr);

[pastarmovj, 2016/11/28 15:53:17]

Done.

+  g_event_source_name = new std::string(name);
+}
+#endif  // defined(OS_WIN)
+
 EventLogMessage::EventLogMessage(const char* file,
                                  int line,
                                  LogSeverity severity)
@@ -27,8 +39,16 @@ EventLogMessage::EventLogMessage(const char* file,
 
 EventLogMessage::~EventLogMessage() {
 #if defined(OS_WIN)
-  const char kEventSource[] = "chrome";
-  HANDLE event_log_handle = RegisterEventSourceA(NULL, kEventSource);
+  // If g_event_source_name is nullptr (which it is per default) SYSLOG will
+  // degrade gracefully to regular LOG with an extra error suffix. If you see
+  // this happening most probably you are using SYSLOG before you called
+  // SetEventSourceName.
+  if (g_event_source_name == nullptr) {
+    stream() << " !!EVENTLOG SOURCE NAME NOT SET!!";
+    return;
+  }
+  HANDLE event_log_handle =
+      RegisterEventSourceA(NULL, g_event_source_name->c_str());
   if (event_log_handle == NULL) {
     stream() << " !!NOT ADDED TO EVENTLOG!!";
     return;