gistfile1.txt

already_AddRefed<Promise>
MediaDevices::GetUserMedia(const MediaStreamConstraints& aConstraints,
                           CallerType aCallerType,
                           ErrorResult &aRv)
{
  RefPtr<Promise> p = Promise::Create(GetParentObject(), aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }
  MediaManager::Get()->GetUserMedia(GetOwner(), aConstraints, aCallerType)->Then(
    GetCurrentThreadSerialEventTarget(), __func__,
    [p](RefPtr<DOMMediaStream>&& aStream) mutable {
      p->MaybeResolve(std::move(aStream));
    },
    [p](RefPtr<MediaStreamError>&& error) mutable {
      p->MaybeReject(std::move(error));
    }
  );
  return p.forget();
}