Add ol.geom.LineString#getCoordinateAtM

src/ol/geom/linestring.js

@@ -80,6 +80,18 @@ ol.geom.LineString.prototype.closestPointXY =
 };
 
 
+/**
+ * @param {number} m M.
+ * @param {boolean=} opt_extrapolate Extrapolate.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.geom.LineString.prototype.getCoordinateAtM = function(m, opt_extrapolate) {
+  var extrapolate = goog.isDef(opt_extrapolate) ? opt_extrapolate : false;
+  return ol.geom.flat.lineStringCoordinateAtM(this.flatCoordinates, 0,
+      this.flatCoordinates.length, this.stride, this.layout, m, extrapolate);
+};
+
+
 /**
  * @return {ol.geom.RawLineString} Coordinates.
  * @todo stability experimental