Fix examples that use WebGLMap

examples/side-by-side.js

@@ -2,12 +2,17 @@ import Map from '../src/ol/Map.js';
 import WebGLMap from '../src/ol/WebGLMap.js';
 import View from '../src/ol/View.js';
 import TileLayer from '../src/ol/layer/Tile.js';
+import WebGLTileLayer from '../src/ol/layer/WebGLTile.js';
 import OSM from '../src/ol/source/OSM.js';
 
 const layer = new TileLayer({
   source: new OSM()
 });
 
+const webGLLayer = new WebGLTileLayer({
+  source: new OSM()
+});
+
 const view = new View({
   center: [0, 0],
   zoom: 1
@@ -21,6 +26,6 @@ const map1 = new Map({
 
 const map2 = new WebGLMap({
   target: 'webglMap',
-  layers: [layer],
+  layers: [webGLLayer],
   view: view
 });