Revert "Revert "Disable GL buffer mapping on TSAN/Mac.""

This reverts commit 4e7cdd5a0052aa76bed6f80ec325be19e09e6ab1.

Bug: skia:7058
Change-Id: I3b92c35835cf7a8c04e9218194bf293b790413e0
Reviewed-on: https://skia-review.googlesource.com/57222
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
6 files changed