WebGPU devices are never destroyed?

[ben-clayton]

As far as I can tell, WebGPU devices are never destroyed. There's a TODO in device_pool.ts for destroying a device:

cts/src/webgpu/util/device_pool.ts

Line 77 in 2ebec0e

// TODO: device.destroy()

If we're not destroying devices, we're not testing tear-down logic, which seems like a big thing to be missing right now.

It also seems that because we're not destroying the devices, the Device.lost promise will never be resolved or rejected.

[kainino0x]

We're not, and that's because we didn't have device destruction until recently. (Actually I'm not even sure whether it's completed yet.)

I have a draft of some tests for device destruction and Device.lost in #687 but haven't finished them.