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

core/vendor/symfony-cmf/routing/PagedRouteProviderInterface.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;
+
+/**
+ * Interface for a provider which allows to retrieve a limited amount of routes.
+ */
+interface PagedRouteProviderInterface extends RouteProviderInterface
+{
+    /**
+     * Find an amount of routes with an offset and possible a limit.
+     *
+     * In case you want to iterate over all routes, you want to avoid to load
+     * all routes at once.
+     *
+     * @param int $offset
+     *   The sequence will start with that offset in the list of all routes.
+     * @param int $length [optional]
+     *   The sequence will have that many routes in it. If no length is
+     *   specified all routes are returned.
+     *
+     * @return \Symfony\Component\Routing\Route[]
+     *   Routes keyed by the route name.
+     */
+    public function getRoutesPaged($offset, $length = null);
+
+    /**
+     * Determines the total amount of routes.
+     *
+     * @return int
+     */
+    public function getRoutesCount();
+}