Add time from navigation_start to NTP LogEvent

chrome/browser/ui/webui/ntp/ntp_user_data_logger.h

Index: chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
diff --git a/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h b/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
index e723c697899f52c7a5f59538860594a2356e0539..2f687a51a56b29da393752240014b9d929899ae0 100644
--- a/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
+++ b/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
@@ -41,9 +41,10 @@ class NTPUserDataLogger
   // the tab/shutting down Chrome), or when the user navigates to a URL.
   void EmitNtpStatistics();
 
-  // Called each time an event occurs on the NTP that requires a counter to be
-  // incremented.
-  void LogEvent(NTPLoggingEventType event);
+  // Called when an event occurs on the NTP that requires a counter to be
+  // incremented. The time parameters contains the time when this event occured
+  // since navigation start.
+  void LogEvent(NTPLoggingEventType event, uint64 time);
 
   // Logs an impression on one of the Most Visited tiles by a given provider.
   void LogMostVisitedImpression(int position, const base::string16& provider);