Move active field trial API to variations component.

chrome/common/metrics/variations/variations_util.cc

 // 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/common/metrics/variations/variations_util.h"
 
-#include <vector>
-
-#include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
 #include "chrome/common/child_process_logging.h"
 #include "chrome/common/crash_keys.h"
+#include "components/variations/active_field_trials.h"
 
 namespace chrome_variations {
 
-namespace {
-
-// Populates |name_group_ids| based on |active_groups|.
-void GetFieldTrialActiveGroupIdsForActiveGroups(
-    const base::FieldTrial::ActiveGroups& active_groups,
-    std::vector<ActiveGroupId>* name_group_ids) {
-  DCHECK(name_group_ids->empty());
-  for (base::FieldTrial::ActiveGroups::const_iterator it =
-       active_groups.begin(); it != active_groups.end(); ++it) {
-    name_group_ids->push_back(MakeActiveGroupId(it->trial_name,
-                                                it->group_name));
-  }
-}
-
-}  // namespace
-
-void GetFieldTrialActiveGroupIds(
-    std::vector<ActiveGroupId>* name_group_ids) {
-  DCHECK(name_group_ids->empty());
-  // A note on thread safety: Since GetActiveFieldTrialGroups() is thread
-  // safe, and we operate on a separate list of that data, this function is
-  // technically thread safe as well, with respect to the FieldTrialList data.
-  base::FieldTrial::ActiveGroups active_groups;
-  base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
-  GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
-                                             name_group_ids);
-}
-
-void GetFieldTrialActiveGroupIdsAsStrings(
-    std::vector<std::string>* output) {
-  DCHECK(output->empty());
-  std::vector<ActiveGroupId> name_group_ids;
-  GetFieldTrialActiveGroupIds(&name_group_ids);
-  for (size_t i = 0; i < name_group_ids.size(); ++i) {
-    output->push_back(base::StringPrintf(
-        "%x-%x", name_group_ids[i].name, name_group_ids[i].group));
-  }
-}
-
 void SetChildProcessLoggingVariationList() {
   std::vector<std::string> experiment_strings;
-  GetFieldTrialActiveGroupIdsAsStrings(&experiment_strings);
+  variations::GetFieldTrialActiveGroupIdsAsStrings(&experiment_strings);
   crash_keys::SetVariationsList(experiment_strings);
 }
 
-// Functions below are exposed for testing explicitly behind this namespace.
-// They simply wrap existing functions in this file.
-namespace testing {
-
-void TestGetFieldTrialActiveGroupIds(
-    const base::FieldTrial::ActiveGroups& active_groups,
-    std::vector<ActiveGroupId>* name_group_ids) {
-  GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
-                                             name_group_ids);
-}
-
-}  // namespace testing
-
 }  // namespace chrome_variations