127   createDatasetIfNeeded(data, entry, data_set) {  argument
128     if (!(data_set in data[entry.isolate].gcs[entry.id])) {
129       data[entry.isolate].gcs[entry.id][data_set] = {
134       data[entry.isolate].data_sets.add(data_set);
138   addFieldTypeData(data, isolate, gc_id, data_set, tagged_fields,  argument
140     data[isolate].gcs[gc_id][data_set].field_data = {
148   addInstanceTypeData(data, isolate, gc_id, data_set, instance_type, entry) {  argument
149     data[isolate].gcs[gc_id][data_set].instance_type_data[instance_type] = {
156     data[isolate].gcs[gc_id][data_set].overall += entry.overall;
158       data[isolate].gcs[gc_id][data_set].non_empty_instance_types.add(
206             Object.keys(actual_data).forEach(data_set => {
207               const string_entry = actual_data[data_set];
211                 this.createDatasetIfNeeded(data, entry, data_set);
218                 this.addFieldTypeData(data, isolate, gc_id, data_set,
223                 data[isolate].gcs[gc_id][data_set].bucket_sizes =
231                       data, isolate, gc_id, data_set, instance_type, value);