Make global use-analytic-AA bit threadsafe.

I also had to cut it down to just a global atomic bool... as a field in a global singleton accessed through instance(), it's very hard to make threadsafe.

CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-Clang-GCE-CPU-AVX2-x86_64-Release-TSAN-Trybot

BUG=skia:

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Change-Id: If80be987906dd521fbe644d1d0d577009f06d0e3
Reviewed-on: https://skia-review.googlesource.com/2937
Reviewed-by: Yuqian Li <liyuqian@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index 1191423544..8d42b12f5e 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -1180,7 +1180,7 @@ int nanobench_main() {
     }
 
     if (FLAGS_analyticAA) {
-        GlobalAAConfig::getInstance().fUseAnalyticAA = true;
+        gSkUseAnalyticAA = true;
     }
 
     int runs = 0;