Function FetchLater

pub(crate) fn FetchLater(
    window: &Window,
    input: RequestInfo<DomTypeHolder>,
    init: RootedTraceableBox<DeferredRequestInit<DomTypeHolder>>,
    can_gc: CanGc,
) -> Fallible<DomRoot<FetchLaterResult>>

https://fetch.spec.whatwg.org/#dom-window-fetchlater