MarkerOptions markerOpts = MarkerOptions.create();
markerOpts.setPosition(pto);
markerOpts.setTitle(trozos[2]);
markerOpts.setMap(map);
final Marker marc = Marker.create(markerOpts);
marc.addClickListener(new ClickHandler() {
@Override
public void handle(MouseEvent event) {
infoWindow.open(map, marc);
}