This is a reland of commit cde5589953
Original change's description:
> Add expectations.txt validation to presubmit
>
> Change-Id: Ibabdfbdf44b027a6e6441e140f23b2c2488f32dc
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/112120
> Reviewed-by: Ben Clayton <bclayton@google.com>
> Commit-Queue: Austin Eng <enga@chromium.org>
> Kokoro: Kokoro <noreply+kokoro@google.com>
Change-Id: I013eeec03e27b3147023ea094f5bde011561edd1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/113540
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Austin Eng <enga@chromium.org>
Kokoro: Austin Eng <enga@chromium.org>
This reverts commit cde5589953.
Reason for revert: Script fails on Windows.
Original change's description:
> Add expectations.txt validation to presubmit
>
> Change-Id: Ibabdfbdf44b027a6e6441e140f23b2c2488f32dc
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/112120
> Reviewed-by: Ben Clayton <bclayton@google.com>
> Commit-Queue: Austin Eng <enga@chromium.org>
> Kokoro: Kokoro <noreply+kokoro@google.com>
# Not skipping CQ checks because original CL landed > 1 day ago.
Change-Id: I106ab755af5fde289c0d014bf3be77d93dfd0beb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/112400
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Auto-Submit: Austin Eng <enga@chromium.org>