Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/http-kernel/DataCollector/DataCollectorInterface.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\DataCollector;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * DataCollectorInterface.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @api
+ */
+interface DataCollectorInterface
+{
+    /**
+     * Collects data for the given Request and Response.
+     *
+     * @param Request    $request   A Request instance
+     * @param Response   $response  A Response instance
+     * @param \Exception $exception An Exception instance
+     *
+     * @api
+     */
+    public function collect(Request $request, Response $response, \Exception $exception = null);
+
+    /**
+     * Returns the name of the collector.
+     *
+     * @return string The collector name
+     *
+     * @api
+     */
+    public function getName();
+}