Omnibox: Create Field Trial for HQP to Ignore Mid-Word Matches

chrome/browser/autocomplete/autocomplete_field_trial.cc

Index: chrome/browser/autocomplete/autocomplete_field_trial.cc
diff --git a/chrome/browser/autocomplete/autocomplete_field_trial.cc b/chrome/browser/autocomplete/autocomplete_field_trial.cc
index edde0cf4036ba54dee21e2d0e9336da9e804bb1f..705e7977c4d423c8389397f9924db32a2f3ac978 100644
--- a/chrome/browser/autocomplete/autocomplete_field_trial.cc
+++ b/chrome/browser/autocomplete/autocomplete_field_trial.cc
@@ -27,6 +27,8 @@ static const char kHUPCreateShorterMatchFieldTrialName[] =
     "OmniboxHUPCreateShorterMatch";
 static const char kHQPReplaceHUPScoringFieldTrialName[] =
     "OmniboxHQPReplaceHUPNumComponentsFix";
+static const char kHQPOnlyCountMatchesAtWordBoundariesFieldTrialName[] =
+    "OmniboxHQPOnlyCountMatchesAtWordBoundaries";
 
 // Field trial experiment probabilities.
 
@@ -74,6 +76,13 @@ const base::FieldTrial::Probability
 const base::FieldTrial::Probability
     kHQPReplaceHUPScoringFieldTrialExperimentFraction = 25;
 
+// For the field trial that ignores all mid-term matches in HistoryQuick
+// provider, put 25% ( = 25/100 ) of the users in the experiment group.
+const base::FieldTrial::Probability
+    kHQPOnlyCountMatchesAtWordBoundariesFieldTrialDivisor = 100;
+const base::FieldTrial::Probability
+    kHQPOnlyCountMatchesAtWordBoundariesFieldTrialExperimentFraction = 25;
+
 
 // Field trial IDs.
 // Though they are not literally "const", they are set only once, in
@@ -97,6 +106,10 @@ int hup_dont_create_shorter_match_experiment_group = 0;
 // experiment group.
 int hqp_replace_hup_scoring_experiment_group = 0;
 
+// Field trial ID for the HistoryQuick provider only count matches at
+// word boundaries experiment group.
+int hqp_only_count_matches_at_word_boundaries_experiment_group = 0;
+
 }
 
 
@@ -191,6 +204,18 @@ void AutocompleteFieldTrial::Activate() {
   trial->UseOneTimeRandomization();
   hqp_replace_hup_scoring_experiment_group = trial->AppendGroup("HQPReplaceHUP",
       kHQPReplaceHUPScoringFieldTrialExperimentFraction);
+
+  // Create the field trial that makes HistoryQuick provider score
+  // ignore all matches that happen in the middle of a word.  Make it
+  // expire on June 23, 2013.
+  trial = base::FieldTrialList::FactoryGetFieldTrial(
+      kHQPOnlyCountMatchesAtWordBoundariesFieldTrialName,
+      kHQPOnlyCountMatchesAtWordBoundariesFieldTrialDivisor,
+      "Standard", 2013, 6, 23, NULL);
+  trial->UseOneTimeRandomization();
+  hqp_only_count_matches_at_word_boundaries_experiment_group =
+      trial->AppendGroup("HQPOnlyCountMatchesAtWordBoundaries",
+          kHQPOnlyCountMatchesAtWordBoundariesFieldTrialExperimentFraction);
 }
 
 bool AutocompleteFieldTrial::InDisallowInlineHQPFieldTrial() {
@@ -264,3 +289,19 @@ bool AutocompleteFieldTrial::InHQPReplaceHUPScoringFieldTrialExperimentGroup() {
       kHQPReplaceHUPScoringFieldTrialName);
   return group == hqp_replace_hup_scoring_experiment_group;
 }
+
+bool AutocompleteFieldTrial::InHQPOnlyCountMatchesAtWordBoundariesFieldTrial() {
+  return base::FieldTrialList::TrialExists(
+      kHQPOnlyCountMatchesAtWordBoundariesFieldTrialName);
+}
+
+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;
+}