| // 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" |
| |
| #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; |
| |
| // Stable channels will run with 10% probability. |
| // Non-stable channels will run with 50% probability. |
| const base::FieldTrial::Probability kTotalProbability = 100; |
| const base::FieldTrial::Probability kEnabledAndControlProbability = |
| is_stable_channel ? 10 : 50; |
| |
| // Experiment enabled until March 15, 2017. By default, disabled. |
| scoped_refptr<base::FieldTrial> trial( |
| base::FieldTrialList::FactoryGetFieldTrial( |
| kPopularSitesFieldTrialName, kTotalProbability, |
| kPopularSiteDefaultGroup, 2017, 3, 15, // Mar 15, 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); |
| trial->AppendGroup(kPopularSiteEnabledGroup, kEnabledAndControlProbability); |
| } |
| } |
| |
| 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 |
| |
| return base::StartsWith(group_name, "Enabled", |
| base::CompareCase::INSENSITIVE_ASCII); |
| } |
| |
| } // namespace ntp_tiles |