Add ol.source.TileWMS#getUrls

src/ol/source/tilewmssource.js

@@ -302,6 +302,16 @@ ol.source.TileWMS.prototype.getTilePixelSize =
 };
 
 
+/**
+ * Return the URLs used for this WMS source.
+ * @return {Array.<string>|undefined} URLs.
+ * @todo stability experimental
+ */
+ol.source.TileWMS.prototype.getUrls = function() {
+  return this.urls_;
+};
+
+
 /**
  * @private
  */