XRManager doesn't setup reference space for non layers.

[danrossi]

Description

I am trying to integrate WebGPURenderer for the node system but also support WebXR I found a bug where the reference space isn't being setup for non layers.

With my headset on Windows I still can't get a WebXR session using the WebGLBackend and get a "page is not responding"

Reproduction steps

Load this demo in a headset that doesn't support layers

https://threejs.org/examples/?q=video#webgpu_xr_cubes

Code

// code goes here

Live example

https://threejs.org/examples/?q=video#webgpu_xr_cubes

Screenshots

No response

Version

r0.175

Device

Desktop

Browser

Chrome

OS

Windows