@exportSymbol ol.render.FeaturesOverlay
@exportProperty ol.render.FeaturesOverlay.prototype.addFeature
@exportProperty ol.render.FeaturesOverlay.prototype.getFeatures
@exportProperty ol.render.FeaturesOverlay.prototype.setFeatures
@exportProperty ol.render.FeaturesOverlay.prototype.setMap
@exportProperty ol.render.FeaturesOverlay.prototype.setStyleFunction
@exportProperty ol.render.FeaturesOverlay.prototype.removeFeature