Annotate benign race on SkPath::fConvexity.

We're tired of this making our TSAN bot flaky, and equally tired of trying to fix it.

BUG=skia:5776

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

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4691

Change-Id: Ib6005282c514a6d785fd4fffe5387cbb1caccbe1
Reviewed-on: https://skia-review.googlesource.com/4691
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
2 files changed