Writing to testName and reading its size isn't thread safe, TSAN reminds us.

Guarding it into a no-op makes it safe.  Looks like this is only used for debugging, presumably singlethreaded?

BUG=
R=caryclark@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/25366002

git-svn-id: http://skia.googlecode.com/svn/trunk@11562 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed