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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/test/base/scoped_metrics_service_for_synthetic_trials.h"
ScopedMetricsServiceForSyntheticTrials::ScopedMetricsServiceForSyntheticTrials(
TestingBrowserProcess* testing_browser_process)
: browser_process_(testing_browser_process) {
CHECK(browser_process_);
auto* local_state = browser_process_->local_state();
CHECK(local_state)
<< "Error: local state prefs are required. In a unit test, this can be "
"set up using base::test::ScopedFeatureList.";
// The `SyntheticTrialsActiveGroupIdProvider` needs to be notified of
// changes from the registry for them to be used through the variations API.
synthetic_trial_registry_observation_.Observe(&synthetic_trial_registry_);
metrics_service_client_.set_synthetic_trial_registry(
&synthetic_trial_registry_);
metrics_state_manager_ = metrics::MetricsStateManager::Create(
local_state, &enabled_state_provider_,
/*backup_registry_key=*/std::wstring(),
/*user_data_dir=*/base::FilePath());
// Needs to be set up, will be updated at each synthetic trial change.
variations::InitCrashKeys();
// Required by `MetricsService` to record UserActions. We don't rely on
// these here, since we never make it start recording metrics, but the task
// runner is still required during the shutdown sequence.
base::SetRecordActionTaskRunner(
base::SingleThreadTaskRunner::GetCurrentDefault());
metrics_service_ = std::make_unique<metrics::MetricsService>(
metrics_state_manager_.get(), &metrics_service_client_, local_state);
browser_process_->SetMetricsService(metrics_service_.get());
}
ScopedMetricsServiceForSyntheticTrials::
~ScopedMetricsServiceForSyntheticTrials() {
// The scope is closing, undo the set up that was done in the constructor:
// `MetricsService` and other necessary parts like crash keys.
browser_process_->SetMetricsService(nullptr);
variations::ClearCrashKeysInstanceForTesting();
// Note: Clears all the synthetic trials, not juste the ones registered
// during the lifetime of this object.
variations::SyntheticTrialsActiveGroupIdProvider::GetInstance()
->ResetForTesting();
}
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