static fromCharCode(array) {
    return shaka.util.StringUtils.fromCharCodeImpl_.value()(array);
  }
Creates a new string from the given array of char codes.

Using String.fromCharCode.apply is risky because you can trigger stack
errors on very large arrays.  This breaks up the array into several pieces
to avoid this.

@param {!TypedArray} array
@return {string}