copyFiltersInto(other) {
    for (const filter of this.requestFilters_) {
      other.requestFilters_.add(filter);
    }
    for (const filter of this.responseFilters_) {
      other.responseFilters_.add(filter);
    }
  }
Copies all of the filters from this networking engine into another.
@param {!shaka.net.NetworkingEngine} other