Respect the tileSize option for XYZ grids

externs/olx.js

@@ -5094,7 +5094,8 @@ olx.tilegrid.WMTSOptions.prototype.tileSizes;
 /**
  * @typedef {{extent: (ol.Extent|undefined),
  *     maxZoom: (number|undefined),
- *     minZoom: (number|undefined)}}
+ *     minZoom: (number|undefined),
+ *     tileSize: (number|undefined)}}
  * @api
  */
 olx.tilegrid.XYZOptions;
@@ -5103,8 +5104,8 @@ olx.tilegrid.XYZOptions;
 /**
  * Extent for the tile grid.  The origin for an XYZ tile grid is the top-left
  * corner of the extent.  The zero level of the grid is defined by the
- * resolution at which one 256 x 256 tile fits in the provided extent.  If not
+ * resolution at which one tile fits in the provided extent.  If not provided,
- * provided, the extent of the EPSG:3857 projection is used.
+ * the extent of the EPSG:3857 projection is used.
  * @type {ol.Extent|undefined}
  */
 olx.tilegrid.XYZOptions.prototype.extent;
@@ -5124,6 +5125,13 @@ olx.tilegrid.XYZOptions.prototype.maxZoom;
 olx.tilegrid.XYZOptions.prototype.minZoom;
 
 
+/**
+ * Tile size in pixels. Default is 256. (Only square tiles are supported.)
+ * @type {number|undefined}
+ */
+olx.tilegrid.XYZOptions.prototype.tileSize;
+
+
 /**
  * @typedef {{resolutions: !Array.<number>}}
  * @api

src/ol/tilegrid/xyztilegrid.js

@@ -24,18 +24,16 @@ goog.require('ol.tilegrid.TileGrid');
  * @api
  */
 ol.tilegrid.XYZ = function(options) {
-  // TODO: accept a tileSize option
-  var tileSize = ol.DEFAULT_TILE_SIZE;
   var extent = goog.isDef(options.extent) ?
       options.extent : ol.proj.EPSG3857.EXTENT;
   var resolutions = ol.tilegrid.resolutionsFromExtent(
-      extent, options.maxZoom, tileSize);
+      extent, options.maxZoom, options.tileSize);
 
   goog.base(this, {
     minZoom: options.minZoom,
     origin: ol.extent.getCorner(extent, ol.extent.Corner.TOP_LEFT),
     resolutions: resolutions,
-    tileSize: tileSize
+    tileSize: options.tileSize
   });
 
 };