function testScanRowId_Empty() {
  if (!capability.indexedDb) {
    return goog.Promise.resolve();
  }

  db = new lf.backstore.IndexedDB(lf.Global.get(), schema);
  return db.init().then(function() {
    assertEquals(1, lf.Row.nextId_);
  });
}
Tests scanRowId() for the case where all tables are empty.
@suppress {accessControls}
@return {!IThenable}