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

core/vendor/symfony-cmf/routing/Event/Events.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\Event;
+
+final class Events
+{
+    /**
+     * Fired before a path is matched in \Symfony\Cmf\Component\Routing\DynamicRouter#match
+     *
+     * The event object is RouteMatchEvent.
+     */
+    const PRE_DYNAMIC_MATCH = 'cmf_routing.pre_dynamic_match';
+
+    /**
+     * Fired before a Request is matched in \Symfony\Cmf\Component\Routing\DynamicRouter#match
+     *
+     * The event object is RouteMatchEvent.
+     */
+    const PRE_DYNAMIC_MATCH_REQUEST = 'cmf_routing.pre_dynamic_match_request';
+}

core/vendor/symfony-cmf/routing/Event/RouterMatchEvent.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\Event;
+
+use Symfony\Component\EventDispatcher\Event;
+use Symfony\Component\HttpFoundation\Request;
+
+class RouterMatchEvent extends Event
+{
+    /**
+     * @var Request
+     */
+    protected $request;
+
+    /**
+     * @param Request $request
+     */
+    public function __construct(Request $request = null)
+    {
+        $this->request = $request;
+    }
+
+    /**
+     * @return Request | null
+     */
+    public function getRequest()
+    {
+        return $this->request;
+    }
+}