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

chrome/browser/autocomplete/autocomplete_log.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_LOG_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_LOG_H_
 
 #include <stddef.h>
 
 #include "base/string16.h"
@@ skipping 11 matching lines @@
   AutocompleteLog(
       const string16& text,
       bool just_deleted_text,
       AutocompleteInput::Type input_type,
       size_t selected_index,
       SessionID::id_type tab_id,
       metrics::OmniboxEventProto::PageClassification
           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();
 
   // The user's input text in the omnibox.
   string16 text;
 
   // Whether the user deleted text immediately before selecting an omnibox
   // suggestion.  This is usually the result of pressing backspace or delete.
   bool just_deleted_text;
 
@@ skipping 18 matching lines @@
   // delta should be computed starting from the second series of
   // modifications.  If we somehow skipped the logic to record
   // the time the user began typing (this should only happen in
   // unit tests), this elapsed time is set to -1 milliseconds.
   base::TimeDelta elapsed_time_since_user_first_modified_omnibox;
 
   // Inline autocompleted length (if displayed).  Set to string16::npos
   // 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;
 
   // Diagnostic information from providers.  See
   // AutocompleteController::AddProvidersInfo() and
   // AutocompleteProvider::AddProviderInfo() above.
   ProvidersInfo providers_info;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_LOG_H_