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

core/vendor/symfony-cmf/routing/RouteReferrersInterface.php

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+<?php
+
+/*
+ * This file is part of the Symfony CMF package.
+ *
+ * (c) 2011-2014 Symfony CMF
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Cmf\Component\Routing;
+
+use Symfony\Component\Routing\Route;
+
+/**
+ * Interface to be implemented by content that exposes editable route
+ * referrers.
+ */
+interface RouteReferrersInterface extends RouteReferrersReadInterface
+{
+    /**
+     * Add a route to the collection.
+     *
+     * @param Route $route
+     */
+    public function addRoute($route);
+
+    /**
+     * Remove a route from the collection.
+     *
+     * @param Route $route
+     */
+    public function removeRoute($route);
+}