WebNN: avoid re-binding buffers upon dispatch()
Re-uses handles generated for validation to avoid re-recording
buffers between dispatches, if unnecessary.
Bug: 40278771
Change-Id: Idcf4c7035d833c8f4b26c3429235a365e7ccbb62
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5531440
Reviewed-by: Austin Sullivan asully@chromium.org
Reviewed-by: Rafael Cintron rafael.cintron@microsoft.com
Reviewed-by: ningxin hu ningxin.hu@intel.com
Commit-Queue: Bryan Bernhart bryan.bernhart@intel.com
Cr-Commit-Position: refs/heads/main@{#1307067}