--- /dev/null
+<?php
+
+namespace Drupal\Core\PageCache;
+
+/**
+ * Defines the interface for compound request policies.
+ */
+interface ChainRequestPolicyInterface extends RequestPolicyInterface {
+
+ /**
+ * Add a policy to the list of policy rules.
+ *
+ * @param \Drupal\Core\PageCache\RequestPolicyInterface $policy
+ * The request policy rule to add.
+ *
+ * @return $this
+ */
+ public function addPolicy(RequestPolicyInterface $policy);
+
+}