ios/chrome/browser/metrics/field_trial_synchronizer.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ios/chrome/browser/metrics/field_trial_synchronizer.h"
   6
   7 #include <vector>
   8
   9 #include "base/logging.h"
  10 #include "components/crash/core/common/crash_keys.h"
  11 #include "components/variations/active_field_trials.h"
  12
  13 namespace ios {
  14
  15 FieldTrialSynchronizer::FieldTrialSynchronizer() {
  16   base::FieldTrialList::AddObserver(this);
  17   SynchronizeCrashKeyExperimentList();
  18 }
  19
  20 FieldTrialSynchronizer::~FieldTrialSynchronizer() {
  21   base::FieldTrialList::RemoveObserver(this);
  22 }
  23
  24 void FieldTrialSynchronizer::OnFieldTrialGroupFinalized(
  25     const std::string& field_trial_name,
  26     const std::string& group_name) {
  27   CHECK(!field_trial_name.empty() && !group_name.empty());
  28   SynchronizeCrashKeyExperimentList();
  29 }
  30
  31 void FieldTrialSynchronizer::SynchronizeCrashKeyExperimentList() {
  32   // TODO(sdefresne): uses variations::SetVariationsListCrashKeys once it is
  33   // componentized and remove this code duplication. http://crbug.com/520070
  34   // tracks the componentization effort.
  35   std::vector<std::string> experiment_strings;
  36   variations::GetFieldTrialActiveGroupIdsAsStrings(&experiment_strings);
  37   crash_keys::SetVariationsList(experiment_strings);
  38 }
  39
  40 }  // namespace ios