function randomizeSchemaName(schema) {
  propertyReplacer.replace(schema, 'name', function() {
    return 'db_' + goog.string.getRandomString();
  });

  return schema;
}
Randomizes the schema name such that a new DB is created for every test run.
@param {!lf.schema.Database} schema
@return {!lf.schema.Database} A schema to be used for testing.