LibWeb: Implement the element location strategies in Web::WebDriver

Userland/Libraries/LibWeb/WebDriver/ElementLocationStrategies.h

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+/*
+ * Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Array.h>
+#include <LibJS/Heap/GCPtr.h>
+#include <LibWeb/DOM/NodeList.h>
+#include <LibWeb/Forward.h>
+#include <LibWeb/WebDriver/Error.h>
+
+namespace Web::WebDriver {
+
+// https://w3c.github.io/webdriver/#dfn-table-of-location-strategies
+enum class LocationStrategy {
+    CssSelector,
+    LinkText,
+    PartialLinkText,
+    TagName,
+    XPath,
+};
+
+Optional<LocationStrategy> location_strategy_from_string(StringView type);
+ErrorOr<JS::NonnullGCPtr<DOM::NodeList>, Error> invoke_location_strategy(LocationStrategy type, DOM::ParentNode& start_node, StringView selector);
+
+}