Issue #3038365: Add the EntityOwnerInterface to BlockContent Entity

Closes #3038365

core/modules/block_content/src/Entity/BlockContent.php

@@ -22,6 +22,7 @@
 use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Field\BaseFieldDefinition;
 use Drupal\block_content\BlockContentInterface;
+use Drupal\user\EntityOwnerTrait;
 
 /**
  * Defines the content block entity class.
@@ -46,6 +47,7 @@
     'langcode' => 'langcode',
     'uuid' => 'uuid',
     'published' => 'status',
+    'owner' => 'uid',
   ],
   handlers: [
     'storage' => SqlContentEntityStorage::class,
@@ -99,6 +101,7 @@
 class BlockContent extends EditorialContentEntityBase implements BlockContentInterface {
 
   use RefinableDependentAccessTrait;
+  use EntityOwnerTrait;
 
   /**
    * The theme the block is being created in.
@@ -202,6 +205,7 @@ public function preSaveRevision(EntityStorageInterface $storage, \stdClass $reco
   public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
     $fields = parent::baseFieldDefinitions($entity_type);
+    $fields += static::ownerBaseFieldDefinitions($entity_type);
 
     $fields['id']->setLabel(t('Content block ID'))
       ->setDescription(t('The content block ID.'));