diff -u b/core/modules/comment/lib/Drupal/comment/CommentAccessController.php b/core/modules/comment/lib/Drupal/comment/CommentAccessController.php
--- b/core/modules/comment/lib/Drupal/comment/CommentAccessController.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentAccessController.php
@@ -16,7 +16,7 @@
  *
  * @see \Drupal\comment\Plugin\Core\Entity\Comment.
  */
-class CommentAccessController extends EntityAccessController {
+class CommentAccessController extends EntityAccessController implements CommentAccessControllerInterface {
 
   /**
    * Overrides \Drupal\Core\Entity\EntityAccessController::viewAccess().
@@ -51,7 +51,7 @@
   }
 
   /**
-   * Implements \Drupal\Core\Entity\EntityAccessController::approveAccess().
+   * Implements \Drupal\comment\CommentAccessControllerInterface::approveAccess().
    */
   public function approveAccess(EntityInterface $entity, $langcode = LANGUAGE_DEFAULT, User $account = NULL) {
     return user_access('administer comments', $account);
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/comment/lib/Drupal/comment/CommentAccessControllerInterface.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\comment\CommentAccessControllerInterface.
+ */
+
+namespace Drupal\comment;
+
+use Drupal\Core\Entity\EntityAccessControllerInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\user\Plugin\Core\Entity\User;
+
+/**
+ * Defines an interface for comment access controller.
+ *
+ * Additional to EntityAccessControllerInterface this adds an access method for
+ * approving a comment.
+ */
+interface CommentAccessControllerInterface extends EntityAccessControllerInterface {
+
+  /**
+   * Checks 'approve' access for a given entity or entity translation.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity for which to check 'delete' access.
+   * @param string $langcode
+   *   (optional) The language code for which to check access. Defaults to
+   *   LANGUAGE_DEFAULT.
+   * @param \Drupal\user\Plugin\Core\Entity\User $account
+   *   (optional) The user for which to check access, or NULL to check access
+   *   for the current user. Defaults to NULL.
+   *
+   * @return bool
+   *   TRUE if access was granted, FALSE otherwise.
+   */
+  public function approveAccess(EntityInterface $entity, $langcode = LANGUAGE_DEFAULT, User $account = NULL);
+
+}