Move active field trial API to variations component.

components/variations/active_field_trials_unittest.cc

Index: components/variations/active_field_trials_unittest.cc
===================================================================
--- components/variations/active_field_trials_unittest.cc	(revision 0)
+++ components/variations/active_field_trials_unittest.cc	(working copy)
@@ -0,0 +1,51 @@
+// Copyright 2014 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 "components/variations/active_field_trials.h"
+
+#include "components/variations/metrics_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace variations {
+
+TEST(VariationsUtilTest, GetFieldTrialActiveGroups) {
+  typedef std::set<ActiveGroupId, ActiveGroupIdCompare> ActiveGroupIdSet;
+  std::string trial_one("trial one");
+  std::string group_one("group one");
+  std::string trial_two("trial two");
+  std::string group_two("group two");
+
+  base::FieldTrial::ActiveGroups active_groups;
+  base::FieldTrial::ActiveGroup active_group;
+  active_group.trial_name = trial_one;
+  active_group.group_name = group_one;
+  active_groups.push_back(active_group);
+
+  active_group.trial_name = trial_two;
+  active_group.group_name = group_two;
+  active_groups.push_back(active_group);
+
+  // Create our expected groups of IDs.
+  ActiveGroupIdSet expected_groups;
+  ActiveGroupId name_group_id;
+  name_group_id.name = metrics::HashName(trial_one);
+  name_group_id.group = metrics::HashName(group_one);
+  expected_groups.insert(name_group_id);
+  name_group_id.name = metrics::HashName(trial_two);
+  name_group_id.group = metrics::HashName(group_two);
+  expected_groups.insert(name_group_id);
+
+  std::vector<ActiveGroupId> active_group_ids;
+  testing::TestGetFieldTrialActiveGroupIds(active_groups, &active_group_ids);
+  EXPECT_EQ(2U, active_group_ids.size());
+  for (size_t i = 0; i < active_group_ids.size(); ++i) {
+    ActiveGroupIdSet::iterator expected_group =
+        expected_groups.find(active_group_ids[i]);
+    EXPECT_FALSE(expected_group == expected_groups.end());
+    expected_groups.erase(expected_group);
+  }
+  EXPECT_EQ(0U, expected_groups.size());
+}
+
+}  // namespace variations