This workaround should only be enabled when ANGLE is built with TSAN
on.

Bug: chromium:1094869
Change-Id: If527457c11ce744b543ac69761cc64235d2f1dd8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2267420Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>