tree db78b38e49f0e0ffb6c39088391de3a5437c71bc
parent 1ef6f7ce62f11c70375d4a57225cf11bbab40c05
author Vardhan Mudunuru <vardhan@google.com> 1543528140 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1543532183 +0000

[modular] Prevent basemgr from shutting down twice.

This happens as a race condition during CQ when a test times out *and*
completes at the same time; in this instance, dev_base_shell calls
BaseShellContext::Shutdown() twice. basemgr should be resilient against
this race.

Testing=ran tests with a smaller timeout and saw that two-time-shutdown
doesn't happen.

Change-Id: I867dc3f84e37eba0eae84c1713206a416b728af1