Method createSubgroups

deps/v8/tools/system-analyzer/view/list-panel.mjs:113–122

(group)

      }

      createSubgroups(group) {
        const map = new Map();
        const tempGroups = [];
        for (let propertyName of this._propertyNames) {
          map.set(
              propertyName,
              groupBy(group.entries, each => each[propertyName], true));
        }
        return map;
      }

      _handleLogEntryClick(e) {
        const group = e.currentTarget.group;