LibWeb: Split FlexStyleValue out of StyleValue.{h,cpp}

Author: https://github.com/AtkinsSJ
Commit: 273b9b4ca1
Pull-request: https://github.com/SerenityOS/serenity/pull/18040

Userland/Libraries/LibWeb/CSS/StyleValues/FlexStyleValue.cpp

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
+ * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
+ * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "FlexStyleValue.h"
+
+namespace Web::CSS {
+
+ErrorOr<String> FlexStyleValue::to_string() const
+{
+    return String::formatted("{} {} {}", TRY(m_properties.grow->to_string()), TRY(m_properties.shrink->to_string()), TRY(m_properties.basis->to_string()));
+}
+
+}