Make tileSize a config option for ol.source.XYZ

externs/olx.js

@@ -5053,6 +5053,7 @@ olx.source.WMTSOptions.prototype.urls;
  *     minZoom: (number|undefined),
  *     tileLoadFunction: (ol.TileLoadFunctionType|undefined),
  *     tilePixelRatio: (number|undefined),
+ *     tileSize: (number|undefined),
  *     tileUrlFunction: (ol.TileUrlFunctionType|undefined),
  *     url: (string|undefined),
  *     urls: (Array.<string>|undefined),
@@ -5129,6 +5130,14 @@ olx.source.XYZOptions.prototype.tileLoadFunction;
 olx.source.XYZOptions.prototype.tilePixelRatio;
 
 
+/**
+ * The tile size used by the tile service. Default is `256` pixels.
+ * @type {number|undefined}
+ * @api
+ */
+olx.source.XYZOptions.prototype.tileSize;
+
+
 /**
  * Optional function to get tile URL given a tile coordinate and the projection.
  * Required if url or urls are not provided.