Omnibox - Boost Frequency Scores Based on Number of Matching Pages

components/omnibox/browser/url_index_private_data.cc

Index: components/omnibox/browser/url_index_private_data.cc
diff --git a/components/omnibox/browser/url_index_private_data.cc b/components/omnibox/browser/url_index_private_data.cc
index a702948211f91be9e6200e557d338118999c1ef8..bc31c7014cdfe956f22366fc3b0d73809d7115ae 100644
--- a/components/omnibox/browser/url_index_private_data.cc
+++ b/components/omnibox/browser/url_index_private_data.cc
@@ -714,12 +714,13 @@ void URLIndexPrivateData::HistoryIdSetToScoredMatches(
   }
 
   // Score the matches.
+  const size_t num_matches = history_id_set.size();
   const base::Time now = base::Time::Now();
   std::transform(
       history_id_set.begin(), history_id_set.end(),
       std::back_inserter(*scored_items),
       [this, &lower_raw_string, &lower_raw_terms,
-       &lower_terms_to_word_starts_offsets, &bookmark_model,
+       &lower_terms_to_word_starts_offsets, &bookmark_model, &num_matches,
        &now](const HistoryID history_id) {

[Peter Kasting, 2016/12/01 07:07:53]

Nit: Bleh, I'm inclined to replace this huge list of captures with just [&].

[Mark P, 2016/12/04 01:06:42]

Done.

         auto hist_pos = history_info_map_.find(history_id);
         const history::URLRow& hist_item = hist_pos->second.url_row;
@@ -730,7 +731,7 @@ void URLIndexPrivateData::HistoryIdSetToScoredMatches(
             lower_raw_terms, lower_terms_to_word_starts_offsets,
             starts_pos->second,
             bookmark_model && bookmark_model->IsBookmarked(hist_item.url()),
-            now);
+            num_matches, now);
       });
 
   // Filter all matches that ended up scoring 0.  (These are usually matches