Gets the XR runtime used to blit the XR view to the on-screen canvas, or null when inactive.
Returns true if no WebXR sessions are active
Client callback: pinch gesture released.
Client callback: pinch gesture started.
Client callback: trigger released.
Client callback: trigger pressed.
Client callback: thumbstick moved.
Optional
Gets the XR runtime used to blit the XR view to the on-screen canvas, or null when inactive.