Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/user/src/RoleStorageInterface.php

@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\user\RoleStorageInterface.
+ */
+
+namespace Drupal\user;
+
+use Drupal\Core\Config\Entity\ConfigEntityStorageInterface;
+
+/**
+ * Defines an interface for role entity storage classes.
+ */
+interface RoleStorageInterface extends ConfigEntityStorageInterface {
+
+  /**
+   * Returns whether a permission is in one of the passed in roles.
+   *
+   * @param string $permission
+   *   The permission.
+   * @param array $rids
+   *   The list of role IDs to check.
+   *
+   * @return bool
+   *   TRUE is the permission is in at least one of the roles. FALSE otherwise.
+   */
+  public function isPermissionInRoles($permission, array $rids);
+
+}