@exportSymbol ol.Extent
@exportProperty ol.Extent.prototype.getCenter
@exportProperty ol.Extent.prototype.getHeight
@exportProperty ol.Extent.prototype.getWidth
@exportProperty ol.Extent.prototype.containsCoordinate
@exportProperty ol.Extent.prototype.containsExtent
@exportProperty ol.Extent.prototype.getBottomLeft
@exportProperty ol.Extent.prototype.getBottomRight
@exportProperty ol.Extent.prototype.getTopLeft
@exportProperty ol.Extent.prototype.getTopRight
@exportProperty ol.Extent.prototype.transform