@exportClass ol.control.ScaleLine ol.control.ScaleLineOptions
@exportProperty ol.control.ScaleLine.prototype.setMap

@exportSymbol ol.control.ScaleLineUnits
@exportProperty ol.control.ScaleLineUnits.DEGREES
@exportProperty ol.control.ScaleLineUnits.IMPERIAL
@exportProperty ol.control.ScaleLineUnits.NAUTICAL
@exportProperty ol.control.ScaleLineUnits.METRIC
@exportProperty ol.control.ScaleLineUnits.US