Adds the generated CTS test list to the existing gn/webgpu-cts group
so that Chromium tests properly include the generated file.
Also updates some existing BUILD.gn file paths to be consistent with
Chromium styling: relative paths without the leading ./ for files
under the current directory and directories before and separate from
individual files.
Bug: dawn:1479
Change-Id: Icce70e7fcee874b6b33c21230c8a4429a1f7ab6c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/98801
Commit-Queue: Austin Eng <enga@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>