/**
  * @see \Drupal\page_manager\Plugin\VariantAwareInterface::getVariants()
  */
 public function getVariants()
 {
     if (!$this->variantCollection) {
         $this->variantCollection = new VariantCollection(\Drupal::service('plugin.manager.display_variant'), $this->getVariantConfig());
         $this->variantCollection->sort();
     }
     return $this->variantCollection;
 }