Make Omnibox's HistoryQuickProvider's new scoring less aggressive

chrome/browser/history/scored_history_match.cc

 // 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.
 
 #include "chrome/browser/history/scored_history_match.h"
 
 #include <algorithm>
 #include <functional>
 #include <iterator>
 #include <numeric>
@@ skipping 101 matching lines @@
   if (use_new_scoring) {
     const float topicality_score = GetTopicalityScore(
         terms.size(), url, url_matches, title_matches, word_starts);
     const float recency_score = GetRecencyScore(
         (now - row.last_visit()).InDays());
     const float popularity_score = GetPopularityScore(
         row.typed_count(), row.visit_count());
 
     // Combine recency, popularity, and topicality scores into one.
     // Example of how this functions: Suppose the omnibox has one
-    // input term.  Suppose we have a URL that has 8 typed visits with
+    // input term.  Suppose we have a URL that has 30 typed visits with
     // the most recent being within a day and the omnibox input term
     // has a single URL hostname hit at a word boundary.  Then this
-    // URL will score 1300 ( = 8 * 162.5), which is exactly the value of
-    // search what you type.  That is, it's the boundary of what might
-    // end up being inlined.
-    raw_score = 162.5 * topicality_score * recency_score * popularity_score;
+    // URL will score 1200 ( = 30 * 40.0).
+    raw_score = 40.0 * topicality_score * recency_score * popularity_score;
     raw_score =
         (raw_score <= kint32max) ? static_cast<int>(raw_score) : kint32max;
   } else {  // "old" scoring
     // Get partial scores based on term matching. Note that the score for
     // each of the URL and title are adjusted by the fraction of the
     // terms appearing in each.
     int url_score = ScoreComponentForMatches(url_matches, url.length()) *
         std::min(url_matches.size(), terms.size()) / terms.size();
     int title_score =
         ScoreComponentForMatches(title_matches, title.length()) *
@@ skipping 387 matching lines @@
   // Add a beacon to the logs that'll allow us to identify later what
   // new scoring state a user is in.  Do this by incrementing a bucket in
   // a histogram, where the bucket represents the user's new scoring state.
   UMA_HISTOGRAM_ENUMERATION(
       "Omnibox.HistoryQuickProviderNewScoringFieldTrialBeacon",
       new_scoring_option, NUM_OPTIONS);
 
 }
 
 }  // namespace history