| // 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/chrome_browser_field_trials.h" |
| |
| #include <string> |
| |
| #include "base/command_line.h" |
| #include "base/feature_list.h" |
| #include "base/files/file_util.h" |
| #include "base/metrics/field_trial.h" |
| #include "base/strings/string_util.h" |
| #include "base/time/time.h" |
| #include "build/build_config.h" |
| #include "chrome/browser/metrics/chrome_metrics_service_client.h" |
| #include "chrome/browser/metrics/chrome_metrics_services_manager_client.h" |
| #include "chrome/browser/metrics/persistent_histograms.h" |
| #include "chrome/common/channel_info.h" |
| #include "chrome/common/chrome_switches.h" |
| #include "components/metrics/metrics_pref_names.h" |
| #include "components/ukm/ukm_recorder_impl.h" |
| #include "components/version_info/version_info.h" |
| |
| #if defined(OS_ANDROID) |
| #include "chrome/browser/chrome_browser_field_trials_mobile.h" |
| #else |
| #include "chrome/browser/chrome_browser_field_trials_desktop.h" |
| #endif |
| |
| #if defined(OS_CHROMEOS) |
| #include "chromeos/services/multidevice_setup/public/cpp/first_run_field_trial.h" |
| #endif |
| |
| namespace { |
| |
| // Create a field trial to control metrics/crash sampling for Stable on |
| // Windows/Android if no variations seed was applied. |
| void CreateFallbackSamplingTrialIfNeeded(base::FeatureList* feature_list) { |
| #if defined(OS_WIN) || defined(OS_ANDROID) |
| ChromeMetricsServicesManagerClient::CreateFallbackSamplingTrial( |
| chrome::GetChannel(), feature_list); |
| #endif // defined(OS_WIN) || defined(OS_ANDROID) |
| } |
| |
| // Create a field trial to control UKM sampling for Stable if no variations |
| // seed was applied. |
| void CreateFallbackUkmSamplingTrialIfNeeded(base::FeatureList* feature_list) { |
| ukm::UkmRecorderImpl::CreateFallbackSamplingTrial( |
| chrome::GetChannel() == version_info::Channel::STABLE, feature_list); |
| } |
| |
| } // namespace |
| |
| ChromeBrowserFieldTrials::ChromeBrowserFieldTrials() {} |
| |
| ChromeBrowserFieldTrials::~ChromeBrowserFieldTrials() { |
| } |
| |
| void ChromeBrowserFieldTrials::SetupFieldTrials() { |
| // Field trials that are shared by all platforms. |
| InstantiateDynamicTrials(); |
| |
| #if defined(OS_ANDROID) |
| chrome::SetupMobileFieldTrials(); |
| #else |
| chrome::SetupDesktopFieldTrials(); |
| #endif |
| } |
| |
| void ChromeBrowserFieldTrials::SetupFeatureControllingFieldTrials( |
| bool has_seed, |
| base::FeatureList* feature_list) { |
| // Only create the fallback trials if there isn't already a variations seed |
| // being applied. This should occur during first run when first-run variations |
| // isn't supported. It's assumed that, if there is a seed, then it either |
| // contains the relavent studies, or is intentionally omitted, so no fallback |
| // is needed. |
| if (!has_seed) { |
| CreateFallbackSamplingTrialIfNeeded(feature_list); |
| CreateFallbackUkmSamplingTrialIfNeeded(feature_list); |
| #if defined(OS_CHROMEOS) |
| chromeos::multidevice_setup::CreateFirstRunFieldTrial(feature_list); |
| #endif |
| } |
| } |
| |
| void ChromeBrowserFieldTrials::InstantiateDynamicTrials() { |
| // Persistent histograms must be enabled as soon as possible. |
| InstantiatePersistentHistograms(); |
| } |