public Builder addRaces(
          org.bwapi.proxy.messages.GameMessages.RaceData.Builder builderForValue) {
        if (racesBuilder_ == null) {
          ensureRacesIsMutable();
          races_.add(builderForValue.build());
          onChanged();
        } else {
          racesBuilder_.addMessage(builderForValue.build());
        }
        return this;
      }