Store field trial parameters in shared memory

base/metrics/field_trial_param_associator.cc

Index: base/metrics/field_trial_param_associator.cc
diff --git a/base/metrics/field_trial_param_associator.cc b/base/metrics/field_trial_param_associator.cc
index b96cc396df874689af034691d9479a780ae78417..f667737d079ae140e49d644c6c0a8794a2d0a6fc 100644
--- a/base/metrics/field_trial_param_associator.cc
+++ b/base/metrics/field_trial_param_associator.cc
@@ -40,6 +40,13 @@ bool FieldTrialParamAssociator::GetFieldTrialParams(
   AutoLock scoped_lock(lock_);
 
   const std::string group_name = FieldTrialList::FindFullName(trial_name);
+  return GetFieldTrialParamsWhileLocked(trial_name, group_name, params);
+}
+
+bool FieldTrialParamAssociator::GetFieldTrialParamsWhileLocked(
+    const std::string& trial_name,
+    const std::string& group_name,
+    FieldTrialParams* params) {
   const FieldTrialKey key(trial_name, group_name);
   if (!ContainsKey(field_trial_params_, key))
     return false;