Omnibox: Add Mid-Input Matching to HistoryQuick Provider

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"
@@ skipping 14 matching lines @@
     "OmniboxSearchSuggestTrialStarted2013Q1";
 static const char kHQPNewScoringFieldTrialName[] =
     "OmniboxHQPNewScoringMax1400";
 static const char kHUPCullRedirectsFieldTrialName[] = "OmniboxHUPCullRedirects";
 static const char kHUPCreateShorterMatchFieldTrialName[] =
     "OmniboxHUPCreateShorterMatch";
 static const char kHQPReplaceHUPScoringFieldTrialName[] =
     "OmniboxHQPReplaceHUPHostFix";
 static const char kHQPOnlyCountMatchesAtWordBoundariesFieldTrialName[] =
     "OmniboxHQPOnlyCountMatchesAtWordBoundaries";
+static const char kHQPUseCursorPositionFieldTrialName[] =
+    "OmniboxHQPUseCursorPosition";
 
 // The autocomplete dynamic field trial name prefix.  Each field trial is
 // configured dynamically and is retrieved automatically by Chrome during
 // the startup.
 const char kAutocompleteDynamicFieldTrialPrefix[] = "AutocompleteDynamicTrial_";
 // The maximum number of the autocomplete dynamic field trials (aka layers).
 const int kMaxAutocompleteDynamicFieldTrials = 5;
 
 // Field trial experiment probabilities.
 
@@ skipping 41 matching lines @@
 const base::FieldTrial::Probability
     kHQPReplaceHUPScoringFieldTrialExperimentFraction = 25;
 
 // For the field trial that ignores all mid-term matches in HistoryQuick
 // provider, put 0% ( = 0/100 ) of the users in the experiment group.
 const base::FieldTrial::Probability
     kHQPOnlyCountMatchesAtWordBoundariesFieldTrialDivisor = 100;
 const base::FieldTrial::Probability
     kHQPOnlyCountMatchesAtWordBoundariesFieldTrialExperimentFraction = 0;
 
+// For the field trial that allows HistoryQuick provider to use the
+// cursor position, put 25% ( = 25/100 ) of the users in the experiment group.
+const base::FieldTrial::Probability
+    kHQPUseCursorPositionFieldTrialDivisor = 100;
+const base::FieldTrial::Probability
+    kHQPUseCursorPositionFieldTrialExperimentFraction = 25;
+
 
 // Field trial IDs.
 // Though they are not literally "const", they are set only once, in
 // Activate() below.
 
 // Whether the static field trials have been initialized by
 // ActivateStaticTrials method.
 bool static_field_trials_initialized = false;
 
 // Field trial ID for the disallow-inline History Quick Provider
@@ skipping 11 matching lines @@
 int hup_dont_create_shorter_match_experiment_group = 0;
 
 // Field trial ID for the HistoryQuick provider replaces HistoryURL provider
 // 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;
 
+// Field trial ID for the HistoryQuick provider use cursor position
+// experiment group.
+int hqp_use_cursor_position_experiment_group = 0;
+
 }
 
 
 void AutocompleteFieldTrial::ActivateStaticTrials() {
   DCHECK(!static_field_trials_initialized);
 
   // Create inline History Quick Provider field trial.
   // Make it expire on November 8, 2012.
   scoped_refptr<base::FieldTrial> trial(
       base::FieldTrialList::FactoryGetFieldTrial(
@@ skipping 89 matching lines @@
   // 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);
 
+  // Create the field trial that allows HistoryQuick provider to break
+  // omnibox inputs at the cursor position.  Make it expire on August 23, 2013.
+  trial = base::FieldTrialList::FactoryGetFieldTrial(
+      kHQPUseCursorPositionFieldTrialName,
+      kHQPUseCursorPositionFieldTrialDivisor,
+      "Standard", 2013, 8, 23, NULL);
+  trial->UseOneTimeRandomization();
+  hqp_use_cursor_position_experiment_group =
+      trial->AppendGroup("HQPUseCursorPosition",
+          kHQPUseCursorPositionFieldTrialExperimentFraction);
+
   static_field_trials_initialized = true;
 }
 
 void AutocompleteFieldTrial::ActivateDynamicTrials() {
   // Initialize all autocomplete dynamic field trials.
   for (int i = 0; i < kMaxAutocompleteDynamicFieldTrials; ++i) {
     base::FieldTrialList::FindValue(
         base::StringPrintf("%s%d", kAutocompleteDynamicFieldTrialPrefix, i));
   }
 }
@@ skipping 87 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;
 }
+
+bool AutocompleteFieldTrial::InHQPUseCursorPositionFieldTrial() {
+  return base::FieldTrialList::TrialExists(kHQPUseCursorPositionFieldTrialName);
+}
+
+bool AutocompleteFieldTrial::
+    InHQPUseCursorPositionFieldTrialExperimentGroup() {
+  if (!InHQPUseCursorPositionFieldTrial())
+    return false;
+
+  // Return true if we're in the experiment group.
+  const int group = base::FieldTrialList::FindValue(
+      kHQPUseCursorPositionFieldTrialName);
+  return group == hqp_use_cursor_position_experiment_group;
+}