Allow tileLoadFunction override for ol.source.TileWMS

src/objectliterals.jsdoc

@@ -579,6 +579,8 @@
  * @property {ol.tilegrid.TileGrid|undefined} tileGrid Tile grid.
  * @property {number|undefined} maxZoom Maximum zoom.
  * @property {ol.proj.ProjectionLike} projection Projection.
+ * @property {ol.TileLoadFunctionType|undefined} tileLoadFunction Optional
+ *     function to load a tile given a URL.
  * @property {string|undefined} url WMS service URL.
  * @property {Array.<string>|undefined} urls WMS service urls. Use this instead
  *     of `url` when the WMS supports multiple urls for GetMap requests.

src/ol/source/tilewmssource.js

@@ -98,6 +98,7 @@ ol.source.TileWMS = function(options) {
     tileGrid: options.tileGrid,
     opaque: !transparent,
     projection: options.projection,
+    tileLoadFunction: options.tileLoadFunction,
     tileUrlFunction: ol.TileUrlFunction.withTileCoordTransform(
         tileCoordTransform, tileUrlFunction)
   });