LibWeb/WebGL: Implement getContextAttributes()

Author: https://github.com/kalenikaliaksandr
Commit: c817eb8d2b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2776

Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp

@@ -131,6 +131,13 @@ bool WebGLRenderingContext::is_context_lost() const
     return m_context_lost;
 }
 
+Optional<WebGLContextAttributes> WebGLRenderingContext::get_context_attributes()
+{
+    if (is_context_lost())
+        return {};
+    return m_actual_context_parameters;
+}
+
 void WebGLRenderingContext::set_size(Gfx::IntSize const& size)
 {
     context().set_size(size);