Omnibox: Create DemoteByType Experiment

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 <map>
 #include <vector>
 
 #include "base/memory/singleton.h"
@@ skipping 127 matching lines @@
     const std::string group_name =
         base::FieldTrialList::FindFullName(trial_name);
     const VariationKey key = VariationKey(trial_name, group_name);
     if (!ContainsKey(variation_params_, key))
       return false;
 
     *params = variation_params_[key];
     return true;
   }
 
+  void ClearAllParamsForTesting() {

[Alexei Svitkine (slow), 2013/08/05 18:33:11]

You will need to rebase this on top of http://crrev.com/r215644 which moved this
code to a different file.

[Mark P, 2013/08/05 22:11:41]

Done.

+    base::AutoLock scoped_lock(lock_);
+    variation_params_.clear();
+  }
+
  private:
   friend struct DefaultSingletonTraits<VariationsParamAssociator>;
 
   VariationsParamAssociator() {}
   ~VariationsParamAssociator() {}
 
   // Tests whether a field trial is active (i.e. group() has been called on it).
   // TODO(asvitkine): Expose this as an API on base::FieldTrial.
   bool IsFieldTrialActive(const std::string& trial_name) {
     base::FieldTrial::ActiveGroups active_groups;
@@ skipping 213 matching lines @@
 }
 
 // Functions below are exposed for testing explicitly behind this namespace.
 // They simply wrap existing functions in this file.
 namespace testing {
 
 void ClearAllVariationIDs() {
   GroupMapAccessor::GetInstance()->ClearAllMapsForTesting();
 }
 
+void ClearAllVariationParams() {
+  VariationsParamAssociator::GetInstance()->ClearAllParamsForTesting();
+}
+
 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