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// Copyright 2016 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 "base/metrics/field_trial.h"
#if defined(OS_ANDROID)
#include <jni.h>
#endif
#include "base/command_line.h"
#include "base/metrics/field_trial.h"
#include "base/strings/string_util.h"
#include "components/ntp_tiles/constants.h"
#include "components/ntp_tiles/field_trial.h"
#include "components/ntp_tiles/switches.h"
#include "components/variations/variations_associated_data.h"
#if defined(OS_ANDROID)
#include "base/android/jni_android.h"
#include "jni/MostVisitedSites_jni.h"
#endif
namespace {
const char kPopularSiteDefaultGroup[] = "Default";
const char kPopularSiteControlGroup[] = "Control";
const char kPopularSiteEnabledGroup[] = "Enabled";
const char kPopularSiteEnabledCommandLineSwitchGroup[] =
"EnabledWithCommandLineSwitch";
const char kPopularSiteDisabledCommandLineSwitchGroup[] =
"DisabledWithCommandLineSwitch";
} // namespace
namespace ntp_tiles {
// On iOS it is not technically possible to prep the field trials on first
// launch, the configuration file is downloaded too late. In order to run some
// experiments that need to be active on first launch to be meaningful these
// are hardcoded, but can be superceeded by a server side config on subsequent
// launches.
void SetUpFirstLaunchFieldTrial(bool is_stable_channel) {
// Check first if a server side config superceeded this experiment.
if (base::FieldTrialList::TrialExists(kPopularSitesFieldTrialName))
return;
// The experiment is only for stable channel, the other channels will simply
// get the default behavior.
if (!is_stable_channel)
return;
// Stable channels will run with 10% probability.
const base::FieldTrial::Probability kTotalProbability = 100;
const base::FieldTrial::Probability kEnabledAndControlProbability = 10;
// Experiment enabled until April 26, 2017.
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial(
kPopularSitesFieldTrialName, kTotalProbability,
kPopularSiteDefaultGroup, 2017, 4, 26, // Apr 26, 2017
base::FieldTrial::ONE_TIME_RANDOMIZED, nullptr));
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(ntp_tiles::switches::kEnableNTPPopularSites)) {
trial->AppendGroup(kPopularSiteEnabledCommandLineSwitchGroup,
kTotalProbability);
} else if (command_line->HasSwitch(
ntp_tiles::switches::kDisableNTPPopularSites)) {
trial->AppendGroup(kPopularSiteDisabledCommandLineSwitchGroup,
kTotalProbability);
} else {
trial->AppendGroup(kPopularSiteControlGroup, kEnabledAndControlProbability);
AssociateGoogleVariationID(variations::GOOGLE_WEB_PROPERTIES,
kPopularSitesFieldTrialName,
kPopularSiteControlGroup, 3312959);
trial->AppendGroup(kPopularSiteEnabledGroup, kEnabledAndControlProbability);
AssociateGoogleVariationID(variations::GOOGLE_WEB_PROPERTIES,
kPopularSitesFieldTrialName,
kPopularSiteEnabledGroup, 3312958);
}
}
bool ShouldShowPopularSites() {
// Note: It's important to query the field trial state first, to ensure that
// UMA reports the correct group.
const std::string group_name =
base::FieldTrialList::FindFullName(kPopularSitesFieldTrialName);
base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
if (cmd_line->HasSwitch(switches::kDisableNTPPopularSites))
return false;
if (cmd_line->HasSwitch(switches::kEnableNTPPopularSites))
return true;
#if defined(OS_ANDROID)
if (Java_MostVisitedSites_isPopularSitesForceEnabled(
base::android::AttachCurrentThread())) {
return true;
}
#endif
#if defined(OS_IOS)
// On iOS, if not enrolled in the experiment, the default is to enable the
// feature.
if (group_name.empty() || (group_name == kPopularSiteDefaultGroup))
return true;
#endif
return base::StartsWith(group_name, "Enabled",
base::CompareCase::INSENSITIVE_ASCII);
}
} // namespace ntp_tiles
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