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diff --git a/web/core/modules/block/src/Plugin/migrate/process/BlockPluginId.php b/web/core/modules/block/src/Plugin/migrate/process/BlockPluginId.php
new file mode 100644
index 000000000..08525674e
--- /dev/null
+++ b/web/core/modules/block/src/Plugin/migrate/process/BlockPluginId.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace Drupal\block\Plugin\migrate\process;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Plugin\MigrateProcessInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * @MigrateProcessPlugin(
+ *   id = "block_plugin_id"
+ * )
+ */
+class BlockPluginId extends ProcessPluginBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * The migration process plugin, configured for lookups in d6_custom_block
+   * and d7_custom_block.
+   *
+   * @var \Drupal\migrate\Plugin\MigrateProcessInterface
+   */
+  protected $migrationPlugin;
+
+  /**
+   * The block_content entity storage handler.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $blockContentStorage;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, array $plugin_definition, EntityStorageInterface $storage, MigrateProcessInterface $migration_plugin) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->blockContentStorage = $storage;
+    $this->migrationPlugin = $migration_plugin;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
+    $entity_manager = $container->get('entity.manager');
+    $migration_configuration = [
+      'migration' => [
+        'd6_custom_block',
+        'd7_custom_block',
+      ],
+    ];
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $entity_manager->getDefinition('block_content') ? $entity_manager->getStorage('block_content') : NULL,
+      $container->get('plugin.manager.migrate.process')->createInstance('migration', $migration_configuration, $migration)
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * Set the block plugin id.
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    if (is_array($value)) {
+      list($module, $delta) = $value;
+      switch ($module) {
+        case 'aggregator':
+          list($type, $id) = explode('-', $delta);
+          if ($type == 'feed') {
+            return 'aggregator_feed_block';
+          }
+          break;
+        case 'menu':
+          return "system_menu_block:$delta";
+        case 'block':
+          if ($this->blockContentStorage) {
+            $block_id = $this->migrationPlugin
+              ->transform($delta, $migrate_executable, $row, $destination_property);
+            if ($block_id) {
+              return 'block_content:' . $this->blockContentStorage->load($block_id)->uuid();
+            }
+          }
+          break;
+        default:
+          break;
+      }
+    }
+    else {
+      return $value;
+    }
+  }
+
+}