merge_pr_48995

webnn: support strides for slice operator

To fix the spec issue:
webmachinelearning/webnn#772

Bug: 376071284
Change-Id: I51dec37ce9a606941be3810ef0fd7b9e66edfef2
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel, mac14.arm64-blink-rel, mac14-blink-rel, mac15.arm64-blink-rel, mac15-blink-rel, linux-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5975313
Commit-Queue: Shiyi Zou [email protected]
Reviewed-by: ningxin hu [email protected]
Auto-Submit: Shiyi Zou [email protected]
Reviewed-by: Alex Gough [email protected]
Cr-Commit-Position: refs/heads/main@{#1378794}