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// 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"
namespace {
// Field trial names.
static const char kAggressiveHUPFieldTrialName[] =
"OmniboxAggressiveHistoryURLProvider";
// Field trial experiment probabilities.
// For aggressive History URL Provider field trial, put 50% ( = 50/100 )
// of the users in the aggressive experiment group.
const base::FieldTrial::Probability kAggressiveHUPFieldTrialDivisor = 100;
const base::FieldTrial::Probability
kAggressiveHUPFieldTrialExperimentFraction = 50;
// Field trial IDs.
// Though they are not literally "const", they are set only once, in
// Activate() below.
// Field trial ID for the aggressive History URL Provider experiment group.
int aggressive_hup_experiment_group = 0;
}
void AutocompleteFieldTrial::Activate() {
// Because users tend to use omnibox without attention to it--habits
// get ingrained, users tend to learn that a particular suggestion is
// at a particular spot in the drop-down--we're going to make these
// field trials sticky. We want users to stay in them once assigned
// so they have a better experience and also so we don't get weird
// effects as omnibox ranking keeps changing and users learn they can't
// trust the omnibox. Hence, to create the field trials we require
// that field trials can be made sticky.
if (base::FieldTrialList::IsOneTimeRandomizationEnabled()) { // sticky trials
// Create aggressive History URL Provider field trial.
// Make it expire on August 1, 2012.
scoped_refptr<base::FieldTrial> trial(new base::FieldTrial(
kAggressiveHUPFieldTrialName, kAggressiveHUPFieldTrialDivisor,
"Standard", 2012, 8, 1));
trial->UseOneTimeRandomization();
aggressive_hup_experiment_group = trial->AppendGroup("Aggressive",
kAggressiveHUPFieldTrialExperimentFraction);
}
}
bool AutocompleteFieldTrial::InAggressiveHUPFieldTrial() {
return base::FieldTrialList::TrialExists(kAggressiveHUPFieldTrialName);
}
bool AutocompleteFieldTrial::InAggressiveHUPFieldTrialExperimentGroup() {
if (!base::FieldTrialList::TrialExists(kAggressiveHUPFieldTrialName))
return false;
// Return true if we're in the aggressive experiment group.
const int group = base::FieldTrialList::FindValue(
kAggressiveHUPFieldTrialName);
return group == aggressive_hup_experiment_group;
}
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