LibWeb/WebGL+Meta: Stub getSupportedExtensions() and getExtension()

Author: https://github.com/kalenikaliaksandr
Commit: 7e78d7d332
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2688
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp

@@ -150,4 +150,14 @@ void WebGLRenderingContext::allocate_painting_surface_if_needed()
     context().allocate_painting_surface_if_needed();
 }
 
+Optional<Vector<String>> WebGLRenderingContext::get_supported_extensions() const
+{
+    return {};
+}
+
+JS::Object* WebGLRenderingContext::get_extension(String const&)
+{
+    return nullptr;
+}
+
 }