LibWeb: Implement WebGL getParameter(COMPRESSED_TEXTURE_FORMATS)

Author: https://github.com/cqundefine
Commit: 932a3328a3
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6663
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/WebGL/WebGLRenderingContext.h

@@ -51,6 +51,7 @@ public:
     WebIDL::Long drawing_buffer_height() const;
 
     virtual bool ext_texture_filter_anisotropic_extension_enabled() const override;
+    virtual ReadonlySpan<WebIDL::UnsignedLong> enabled_compressed_texture_formats() const override;
 
 private:
     virtual void initialize(JS::Realm&) override;
@@ -81,6 +82,8 @@ private:
 
     GLenum m_error { 0 };
 
+    Vector<WebIDL::UnsignedLong> m_enabled_compressed_texture_formats;
+
     // Extensions
     // "Multiple calls to getExtension with the same extension string, taking into account case-insensitive comparison, must return the same object as long as the extension is enabled."
     GC::Ptr<Extensions::ANGLEInstancedArrays> m_angle_instanced_arrays_extension;