Add GPUTestConfig::kOsMacBigSur

This is causing the test GPUTestConfigTest.LoadCurrentConfig to fail.

Bug: 1101436
Change-Id: I3b3c80de68e222f19d7aa7fc7b9eaf1aac8a4437
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285339
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#786532}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: ff6293cd18c08fd5be89ffd56bcbc8f240179be5
2 files changed