withTileReference(referenceTile) {
            this._temporaryTileRef = referenceTile;
            return this;
        }
Must be called before transformTo or setDataAs. To keep
compatible api with CacheRecord where tile refs are known.
@param {OpenSeadragon.Tile} referenceTile reference tile for conversion
@return {OpenSeadragon.InternalCacheRecord} self reference for builder pattern