Omnibox: In UMA logs, record typed_count of URLS.

chrome/browser/autocomplete/autocomplete_match.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_MATCH_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_
 #pragma once
 
 #include <vector>
 #include <string>
@@ skipping 185 matching lines @@
 
   // The relevance of this match. See table in autocomplete.h for scores
   // returned by various providers. This is used to rank matches among all
   // responding providers, so different providers must be carefully tuned to
   // supply matches with appropriate relevance.
   //
   // TODO(pkasting): http://b/1111299 This should be calculated algorithmically,
   // rather than being a fairly fixed value defined by the table above.
   int relevance;
 
+  // How many times this result was typed in / selected from the omnibox.
+  // Only set for some providers and result_types.  If it is not set,
+  // its value is -1.  At the time of writing this comment, it is only
+  // set for matches from HistoryURL and HistoryQuickProvider.
+  int typed_count;
+
   // True if the user should be able to delete this match.
   bool deletable;
 
   // This string is loaded into the location bar when the item is selected
   // by pressing the arrow keys. This may be different than a URL, for example,
   // for search suggestions, this would just be the search terms.
   string16 fill_into_edit;
 
   // The position within fill_into_edit from which we'll display the inline
   // autocomplete string.  This will be string16::npos if this match should
@@ skipping 60 matching lines @@
   void ValidateClassifications(
       const string16& text,
       const ACMatchClassifications& classifications) const;
 #endif
 };
 
 typedef AutocompleteMatch::ACMatchClassification ACMatchClassification;
 typedef std::vector<ACMatchClassification> ACMatchClassifications;
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_MATCH_H_