impl CanvasRenderingContext2D {
    pub fn new_inherited(
        global: &GlobalScope,
        canvas: Option<&HTMLCanvasElement>,
        image_cache: Arc<dyn ImageCache>,
        base_url: ServoUrl,
        size: Size2D<u32>,
    ) -> CanvasRenderingContext2D {
        CanvasRenderingContext2D {
            reflector_: Reflector::new(),
            canvas: canvas.map(Dom::from_ref),
            image_cache: image_cache,
            base_url: base_url,
            canvas_state: DomRefCell::new(CanvasState::new(
                global,
                image_cache,
                base_url,
                Size2D::new(size.width as u64, size.height as u64),
            )),
        }
    }

    pub fn new(
        global: &GlobalScope,
        canvas: &HTMLCanvasElement,
        size: Size2D<u32>,
    ) -> DomRoot<CanvasRenderingContext2D> {
        let window = window_from_node(canvas);
        let image_cache = window.image_cache();
        let base_url = window.get_url();
        let boxed = Box::new(CanvasRenderingContext2D::new_inherited(
            global,
            Some(canvas),
            image_cache,
            base_url,
            size,
        ));
        reflect_dom_object(boxed, global, CanvasRenderingContext2DBinding::Wrap)
    }