This migration was non-trivial!
On the WebGPU side, a change in how load and store operations in render
attachments were represented meant that we needed to re-work FFI for
`RenderPassDepthStencilAttachment` and `RenderPassColorAttachment`, with
most of the effort going towards the former. These types, along with
`Option`, needed FFI-friendly replacements for `Option` and the related
types in `wgpu-core`.
There was also some housekeeping done to avoid duplicate dependencies:
* Create `thiserror` shim that downgrades v2 → v1. Otherwise, v2 would
be brought in by the new WGPU. We can't go in the opposite direction
yet, because `bitsclient` has code that breaks on upgrade. The next
patch in this series addresses this, and reverses the direction of the
shim.
* Also remove the now-unused shim adapting from `cfg_aliases` 0.1 to
0.2.
Co-Authored-By: Jim Blandy <jimb@red-bean.com>
Differential Revision: https://phabricator.services.mozilla.com/D233192
fc9ac9cdaf