Overrides Entity::getBCEntity().
Overrides EntityNG::getBCEntity
public function getBCEntity() {
  if (!isset($this->bcEntity)) {
    // Initialize field definitions so that we can pass them by reference.
    $this
      ->getPropertyDefinitions();
    $this->bcEntity = new UserBCDecorator($this, $this->fieldDefinitions);
  }
  return $this->bcEntity;
}