function upgradeAddTableColumn(date, dbInterface) {
  // Cast for test coverage tool.
  var db = /** @type {!lf.backstore.IndexedDBRawBackStore} */ (dbInterface);
  assertEquals(1, db.getVersion());
  return db.addTableColumn('tableA_', 'dob', date);
}
@param {!Date} date
@param {!lf.raw.BackStore} dbInterface
@return {!IThenable}