Omnibiox: Tweak HQP New Scoring and Re-Enable Field Trial

chrome/browser/autocomplete/autocomplete_field_trial.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/autocomplete/autocomplete_field_trial.h"
 
 #include <string>
 
 #include "base/metrics/field_trial.h"
 #include "base/string_number_conversions.h"
 #include "chrome/common/metrics/variations/variation_ids.h"
 #include "chrome/common/metrics/variations/variations_util.h"
 
 namespace {
 
 // Field trial names.
 static const char kDisallowInlineHQPFieldTrialName[] =
     "OmniboxDisallowInlineHQP";
 // Because we regularly change the name of the suggest field trial in
 // order to shuffle users among groups, we use the date the current trial
 // was created as part of the name.
 static const char kSuggestFieldTrialStarted2012Q4Name[] =
     "OmniboxSearchSuggestTrialStarted2012Q4";
-static const char kHQPNewScoringFieldTrialName[] = "OmniboxHQPNewScoring";
+static const char kHQPNewScoringFieldTrialName[] =
+    "OmniboxHQPNewScoringMax1400";
 static const char kHUPCullRedirectsFieldTrialName[] = "OmniboxHUPCullRedirects";
 static const char kHUPCreateShorterMatchFieldTrialName[] =
     "OmniboxHUPCreateShorterMatch";
 static const char kHQPReplaceHUPScoringFieldTrialName[] =
     "OmniboxHQPReplaceHUPNumComponentsFix";
 static const char kHQPOnlyCountMatchesAtWordBoundariesFieldTrialName[] =
     "OmniboxHQPOnlyCountMatchesAtWordBoundaries";
 
 // Field trial experiment probabilities.
 
 // For inline History Quick Provider field trial, put 0% ( = 0/100 )
 // of the users in the disallow-inline experiment group.
 const base::FieldTrial::Probability kDisallowInlineHQPFieldTrialDivisor = 100;
 const base::FieldTrial::Probability
     kDisallowInlineHQPFieldTrialExperimentFraction = 0;
 
 // For the search suggestion field trial, divide the people in the
 // trial into 20 equally-sized buckets.  The suggest provider backend
 // will decide what behavior (if any) to change based on the group.
 const int kSuggestFieldTrialNumberOfGroups = 20;
 
-// For History Quick Provider new scoring field trial, put 0% ( = 0/100 )
+// For History Quick Provider new scoring field trial, put 25% ( = 25/100 )
 // of the users in the new scoring experiment group.
 const base::FieldTrial::Probability kHQPNewScoringFieldTrialDivisor = 100;
 const base::FieldTrial::Probability
-    kHQPNewScoringFieldTrialExperimentFraction = 0;
+    kHQPNewScoringFieldTrialExperimentFraction = 25;
 
 // For HistoryURL provider cull redirects field trial, put 0% ( = 0/100 )
 // of the users in the don't-cull-redirects experiment group.
 // TODO(mpearson): Remove this field trial and the code it uses once I'm
 // sure it's no longer needed.
 const base::FieldTrial::Probability kHUPCullRedirectsFieldTrialDivisor = 100;
 const base::FieldTrial::Probability
     kHUPCullRedirectsFieldTrialExperimentFraction = 0;
 
 // For HistoryURL provider create shorter match field trial, put 0%
@@ skipping 98 matching lines @@
         static_cast<chrome_variations::VariationID>(
             chrome_variations::kSuggestTrialStarted2012Q4IDMin + i));
   }
 
   // Make sure that we participate in the suggest experiment by calling group()
   // on the newly created field trial.  This is necessary to activate the field
   // trial group as there are no more references to it within the Chrome code.
   trial->group();
 
   // Create inline History Quick Provider new scoring field trial.
-  // Make it expire on January 14, 2013.
+  // Make it expire on April 14, 2013.
   trial = base::FieldTrialList::FactoryGetFieldTrial(
       kHQPNewScoringFieldTrialName, kHQPNewScoringFieldTrialDivisor,
-      "Standard", 2013, 1, 14, NULL);
+      "Standard", 2013, 4, 14, NULL);
   trial->UseOneTimeRandomization();
   hqp_new_scoring_experiment_group = trial->AppendGroup("NewScoring",
       kHQPNewScoringFieldTrialExperimentFraction);
 
   // Create the HistoryURL provider cull redirects field trial.
   // Make it expire on March 1, 2013.
   trial = base::FieldTrialList::FactoryGetFieldTrial(
       kHUPCullRedirectsFieldTrialName, kHUPCullRedirectsFieldTrialDivisor,
       "Standard", 2013, 3, 1, NULL);
   trial->UseOneTimeRandomization();
@@ skipping 115 matching lines @@
 bool AutocompleteFieldTrial::
     InHQPOnlyCountMatchesAtWordBoundariesFieldTrialExperimentGroup() {
   if (!InHQPOnlyCountMatchesAtWordBoundariesFieldTrial())
     return false;
 
   // Return true if we're in the experiment group.
   const int group = base::FieldTrialList::FindValue(
       kHQPOnlyCountMatchesAtWordBoundariesFieldTrialName);
   return group == hqp_only_count_matches_at_word_boundaries_experiment_group;
 }