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..d1c28ef2e956a62e2439a0ed5bba07552073ffcf 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, int64 time);
 
   // Logs an impression on one of the Most Visited tiles by a given provider.
   void LogMostVisitedImpression(int position, const base::string16& provider);
@@ -96,6 +97,8 @@ class NTPUserDataLogger
   // Total number of mouseovers for this NTP session.
   size_t number_of_mouseovers_;
 
+  int64 load_time_;
+
   // The URL of this New Tab Page - varies based on NTP version.
   GURL ntp_url_;