Add data usage tracking for image fetcher 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 fb57555a45f8d2ec6eb93ab0da98348be455f8e2..32fe798e1af231831bcb69fc770df5e9afe7b357 100644
--- a/components/data_use_measurement/core/data_use_user_data.cc
+++ b/components/data_use_measurement/core/data_use_user_data.cc
@@ -108,6 +108,8 @@ std::string DataUseUserData::GetServiceNameAsString(ServiceName service_name) {
       return "NetworkTimeTracker";
     case SUPERVISED_USER:
       return "SupervisedUser";
+    case IMAGE_FETCHER_UNTAGGED:
+      return "ImageFetcherUntagged";
   }
   return "INVALID";
 }