LibWeb: Implement WebGL extension OES_standard_derivatives

Author: https://github.com/cqundefine
Commit: d4ac9fc5c6
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6711
Reviewed-by: https://github.com/awesomekling

Libraries/LibWeb/WebGL/Extensions/OESStandardDerivatives.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2025, Undefine <undefine@undefine.pl>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Realm.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/OESStandardDerivativesPrototype.h>
+#include <LibWeb/WebGL/Extensions/OESStandardDerivatives.h>
+#include <LibWeb/WebGL/OpenGLContext.h>
+#include <LibWeb/WebGL/WebGLRenderingContext.h>
+
+namespace Web::WebGL::Extensions {
+
+GC_DEFINE_ALLOCATOR(OESStandardDerivatives);
+
+JS::ThrowCompletionOr<GC::Ptr<OESStandardDerivatives>> OESStandardDerivatives::create(JS::Realm& realm, GC::Ref<WebGLRenderingContext> context)
+{
+    return realm.create<OESStandardDerivatives>(realm, context);
+}
+
+OESStandardDerivatives::OESStandardDerivatives(JS::Realm& realm, GC::Ref<WebGLRenderingContext> context)
+    : PlatformObject(realm)
+    , m_context(context)
+{
+    m_context->context().request_extension("GL_OES_standard_derivatives");
+}
+
+void OESStandardDerivatives::initialize(JS::Realm& realm)
+{
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(OESStandardDerivatives);
+    Base::initialize(realm);
+}
+
+void OESStandardDerivatives::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_context);
+}
+
+}