Avoid creating unnecessary images during rendering

src/ol/renderer/canvas/canvastilelayerrenderer.js

@@ -287,11 +287,7 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   /** @type {Array.<ol.Tile>} */
   var tilesToClear = [];
 
-  var getTileIfLoaded = this.createGetTileIfLoadedFunction(function(tile) {
-    return !goog.isNull(tile) && tile.getState() == ol.TileState.LOADED;
-  }, tileSource, pixelRatio, projection);
-  var findLoadedTiles = goog.bind(tileSource.findLoadedTiles, tileSource,
-      tilesToDrawByZ, getTileIfLoaded);
+  var findLoadedTiles = this.createLoadedTileFinder(tileSource, tilesToDrawByZ);
 
   var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();