function updateTile(info){
            let tile = info.tile;
            if(tile && tile.loaded){
                let tileIsBlending = _this._blendTile(
                    tile,
                    tile.x,
                    tile.y,
                    info.level,
                    info.levelOpacity,
                    currentTime,
                    lowestLevel
                );
                _this._isBlending = _this._isBlending || tileIsBlending;
                _this._needsDraw = _this._needsDraw || tileIsBlending || _this._wasBlending;
            }
        }
Update all tiles that contribute to the current view
@private