Roll WebGPU CTS from 3f3c9da15a14 to 2f0de1ee3917 (2 revisions)

https://chromium.googlesource.com/external/github.com/gpuweb/cts.git/+log/3f3c9da15a14..2f0de1ee3917

2024-03-29 tojiro@gmail.com wgsl: Validation for step builtin function
2024-03-29 tojiro@gmail.com wgsl: Validation for trunc builtin function

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webgpu-cts-chromium-autoroll
Please CC dneto@google.com,webgpu-developers@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:dawn-android-arm-deps-rel;luci.chromium.try:dawn-android-arm64-deps-rel;luci.chromium.try:dawn-linux-x64-deps-rel;luci.chromium.try:dawn-mac-x64-deps-rel;luci.chromium.try:dawn-mac-arm64-deps-rel;luci.chromium.try:dawn-win10-x64-deps-rel;luci.chromium.try:dawn-win10-x86-deps-rel
Bug: None
Tbr: dneto@google.com
Change-Id: I1e02f591cc36cc42276b60f966450cb24e44f49e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5408691
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1280478}