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

vendor/symfony/http-foundation/Tests/ClockMock.php

@@ -0,0 +1,39 @@
+<?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\HttpFoundation;
+
+function time()
+{
+    return Tests\time();
+}
+
+namespace Symfony\Component\HttpFoundation\Tests;
+
+function with_clock_mock($enable = null)
+{
+    static $enabled;
+
+    if (null === $enable) {
+        return $enabled;
+    }
+
+    $enabled = $enable;
+}
+
+function time()
+{
+    if (!with_clock_mock()) {
+        return \time();
+    }
+
+    return $_SERVER['REQUEST_TIME'];
+}