Add skia_tsan_build to match skia_asan_build and fix one example race.

R=mtklein@google.com

Review URL: https://codereview.chromium.org/24644003

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@11464 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed