Meta+WebContent+LibWeb: Add, link and initialize SDL3

Author: https://github.com/Lubrsi
Commit: 50dcd8fc85
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5902
Reviewed-by: https://github.com/gmta
Reviewed-by: https://github.com/trflynn89

Services/WebContent/main.cpp

@@ -48,6 +48,8 @@
 #    include <LibCore/Platform/ProcessStatisticsMach.h>
 #endif
 
+#include <SDL3/SDL_init.h>
+
 static ErrorOr<void> load_content_filters(StringView config_path);
 
 static ErrorOr<void> initialize_resource_loader(GC::Heap&, int request_server_socket);
@@ -60,6 +62,12 @@ ErrorOr<int> ladybird_main(Main::Arguments arguments)
 {
     AK::set_rich_debug_enabled(true);
 
+    // SDL is used for the Gamepad API.
+    if (!SDL_Init(SDL_INIT_GAMEPAD)) {
+        dbgln("Failed to initialize SDL3: {}", SDL_GetError());
+        return -1;
+    }
+
 #if defined(HAVE_QT_MULTIMEDIA)
     QCoreApplication app(arguments.argc, arguments.argv);