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

vendor/symfony/serializer/Mapping/Factory/ClassMetadataFactoryInterface.php

@@ -0,0 +1,53 @@
+<?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\Serializer\Mapping\Factory;
+
+use Symfony\Component\Serializer\Exception\InvalidArgumentException;
+use Symfony\Component\Serializer\Mapping\ClassMetadataInterface;
+
+/**
+ * Returns a {@see ClassMetadataInterface}.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+interface ClassMetadataFactoryInterface
+{
+    /**
+     * If the method was called with the same class name (or an object of that
+     * class) before, the same metadata instance is returned.
+     *
+     * If the factory was configured with a cache, this method will first look
+     * for an existing metadata instance in the cache. If an existing instance
+     * is found, it will be returned without further ado.
+     *
+     * Otherwise, a new metadata instance is created. If the factory was
+     * configured with a loader, the metadata is passed to the
+     * {@link \Symfony\Component\Serializer\Mapping\Loader\LoaderInterface::loadClassMetadata()} method for further
+     * configuration. At last, the new object is returned.
+     *
+     * @param string|object $value
+     *
+     * @return ClassMetadataInterface
+     *
+     * @throws InvalidArgumentException
+     */
+    public function getMetadataFor($value);
+
+    /**
+     * Checks if class has metadata.
+     *
+     * @param mixed $value
+     *
+     * @return bool
+     */
+    public function hasMetadataFor($value);
+}