Description

queue.submit currently consumes and drop command buffers. I think that it makes sense for the rust API, however in WebGPU command buffers are only marked as invalid when submitted. It's a small detail but it means that wgpu_core can't drop the command buffers in submit, they have to be marked as invalid/destroyed and potentially used after submission in various API entry points (causing validation errors but not panics).

Two solutions:

• Make wgpu match the spec and take command buffers by reference instead of by value in submit (implying they are marked invalid and not dropped).
• Have wgpu_core optionally drop the handles (would be dropped when used throu wgpu, but not for direct users of wgpu_core such as gecko.

I am leaning on the latter since I think that it makes for a somewhat more idiomatic/nicer API for wgpu users although the implementation is more convoluted than doing the first solutions.

Thoughts ?

Repro steps

Running into double-destroyed command buffers in the CTS in firefox.