Add data usage tracking for supervised_user service

components/data_use_measurement/core/data_use_user_data.cc

Index: components/data_use_measurement/core/data_use_user_data.cc
diff --git a/components/data_use_measurement/core/data_use_user_data.cc b/components/data_use_measurement/core/data_use_user_data.cc
index 69d52fa322dac5a7f76327fd0b085f942a5b2969..fb57555a45f8d2ec6eb93ab0da98348be455f8e2 100644
--- a/components/data_use_measurement/core/data_use_user_data.cc
+++ b/components/data_use_measurement/core/data_use_user_data.cc
@@ -106,6 +106,8 @@ std::string DataUseUserData::GetServiceNameAsString(ServiceName service_name) {
       return "WebHistoryService";
     case NETWORK_TIME_TRACKER:
       return "NetworkTimeTracker";
+    case SUPERVISED_USER:
+      return "SupervisedUser";
   }
   return "INVALID";
 }