WebGL expectations for Mac NVIDIA

Bug: None
No-Try: True
Change-Id: Ib458b34c7415bb67e55d8bbb4e3e2a6f75bdd810
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3884727
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1044789}