LibWeb: Implement window.matchMedia()

Author: https://github.com/linusg
Commit: 51da5d03da
Pull-request: https://github.com/SerenityOS/serenity/pull/10002

Userland/Libraries/LibWeb/DOM/Window.cpp

@@ -195,4 +195,9 @@ NonnullRefPtr<CSS::CSSStyleDeclaration> Window::get_computed_style(DOM::Element&
     return CSS::CSSStyleDeclaration::create(move(properties), move(custom_properties));
 }
 
+NonnullRefPtr<CSS::MediaQueryList> Window::match_media(String media)
+{
+    return CSS::MediaQueryList::create(associated_document(), move(media));
+}
+
 }