GitLab

This CL increases the shard count from 10 to 21, which matches the
count specified in test_suite_exceptions.pyl.

TBR=jbudorick@chromium.org

Bug: 938656
Change-Id: I37bfa264ea7ee37fb092eec5f8b4267adb2ea2ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504978Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638036}