getTilePixelSize(z, pixelRatio, projection) {
    const tileGrid = this.getTileGridForProjection(projection);
    const tileSize = toSize(tileGrid.getTileSize(z), this.tmpSize);
    return [
      Math.round(tileSize[0] * pixelRatio),
      Math.round(tileSize[1] * pixelRatio),
    ];
  }
@param {number} z Z.
@param {number} pixelRatio Pixel ratio.
@param {import("../proj/Projection.js").default} projection Projection.
@return {import("../size.js").Size} Tile size.
@override