Add severity info to drive::EventLogger.

chrome/browser/sync_file_system/logger.cc

Index: chrome/browser/sync_file_system/logger.cc
diff --git a/chrome/browser/sync_file_system/logger.cc b/chrome/browser/sync_file_system/logger.cc
index 7e5e628aaa001c774c5689e8940f45f3419a8976..4f4bede73c6e54eae65c0e836fe07c639736b469 100644
--- a/chrome/browser/sync_file_system/logger.cc
+++ b/chrome/browser/sync_file_system/logger.cc
@@ -54,7 +54,9 @@ void Log(logging::LogSeverity severity,
   // On thread-safety: LazyInstance guarantees thread-safety for the object
   // creation. EventLogger::Log() internally maintains the lock.
   drive::EventLogger* ptr = g_logger.Pointer();
-  ptr->Log("[%s] %s", LogSeverityToString(severity), what.c_str());
+  ptr->Log(severity, base::StringPrintf("[%s] %s",
+                                        LogSeverityToString(severity),
+                                        what.c_str()));
 
   // Log to console if the severity is at or above the min level.
   // LOG_VERBOSE logs are also output if the verbosity of this module