WebNN: Implement scatterND in DirectML backend
This CL also adds WPT and fixes a mojo comment format issue for
scatterND.
Bug: 363761938
Change-Id: Icaa6ba11943f7e89796f13b70e637c7ec496dd75
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/+/5862351
Reviewed-by: Alex Gough ajgo@chromium.org
Reviewed-by: Weizhong Xia weizhong@google.com
Commit-Queue: ningxin hu ningxin.hu@intel.com
Reviewed-by: Rafael Cintron rafael.cintron@microsoft.com
Cr-Commit-Position: refs/heads/main@{#1357392}