Omnibox: Log Elapsed Time Since Last Time The Default Match Changed

chrome/browser/autocomplete/autocomplete_log.h

Index: chrome/browser/autocomplete/autocomplete_log.h
diff --git a/chrome/browser/autocomplete/autocomplete_log.h b/chrome/browser/autocomplete/autocomplete_log.h
index 245481b386bdc4ece62355f141597e1ebc8f5b5c..2782eefeecf1602ac34b0686bb8f8bca65fceafb 100644
--- a/chrome/browser/autocomplete/autocomplete_log.h
+++ b/chrome/browser/autocomplete/autocomplete_log.h
@@ -29,6 +29,7 @@ struct AutocompleteLog {
           current_page_classification,
       base::TimeDelta elapsed_time_since_user_first_modified_omnibox,
       size_t inline_autocompleted_length,
+      base::TimeDelta elapsed_time_since_last_change_to_default_match,
       const AutocompleteResult& result);
   ~AutocompleteLog();
 
@@ -67,6 +68,11 @@ struct AutocompleteLog {
   // if not available.
   size_t inline_autocompleted_length;
 
+  // The amount of time since the last time the default (i.e., inline)
+  // match changed.  This will certainly be less than
+  // elapsed_time_since_user_first_modified_omnibox.
+  base::TimeDelta elapsed_time_since_last_change_to_default_match;
+
   // Result set.
   const AutocompleteResult& result;