LibWeb: Implement 'Strip url for use as a referrer' AO

Author: https://github.com/linusg
Commit: 1e5cac9e9c
Pull-request: https://github.com/SerenityOS/serenity/pull/15795
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/davidot ✅

Userland/Libraries/LibWeb/ReferrerPolicy/AbstractOperations.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+
+namespace Web::ReferrerPolicy {
+
+enum class OriginOnly {
+    Yes,
+    No,
+};
+
+Optional<AK::URL> strip_url_for_use_as_referrer(Optional<AK::URL>, OriginOnly origin_only = OriginOnly::No);
+
+}