Addresses TSAN error in Chromium viz_unittests and cc_unittests.

Bug: b/139010488
Change-Id: I1a53487c4787170c38898cca47bf76145ebdf6bd
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/35608
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>