code: function(layerModel, gmapsMap) {
    cdb.geo.GMapsLayerView.call(this, layerModel, this, gmapsMap);
    this.tileSize = new google.maps.Size(256, 256);
    this.opacity = 1.0;
    this.isPng = true;
    this.maxZoom = 22;
    this.minZoom = 0;
    this.name= 'cartodb tiled layer';
    google.maps.ImageMapType.call(this, this);
  }
docs: TILED LAYER