Trait XRInputSourceMethods 
Source pub trait XRInputSourceMethods<D>{
    // Required methods
    fn Handedness(&self) -> XRHandedness;
    fn TargetRayMode(&self) -> XRTargetRayMode;
    fn TargetRaySpace(&self) -> Root<Dom<<D as DomTypes>::XRSpace>>;
    fn GetGripSpace(&self) -> Option<Root<Dom<<D as DomTypes>::XRSpace>>>;
    fn Profiles(&self, cx: JSContext, retval: MutableHandle<'_, Value>);
    fn SkipRendering(&self) -> bool;
    fn GetGamepad(&self) -> Option<Root<Dom<<D as DomTypes>::Gamepad>>>;
    fn GetHand(&self) -> Option<Root<Dom<<D as DomTypes>::XRHand>>>;
}