Gerrit git cl: add description cache handling regression test.
Gerrit git cl: add description cache handling regression test.

Follow up on https://chromium-review.googlesource.com/#/c/439877/
which fixed a bug.

R=1ebccd90c2bc76de65b6f830f2128a91ed69fdfb@chromium.org
BUG=688765

Change-Id: I8cfc5feb2d8060182572b2d4ecb6a038bf1e0abf
Reviewed-on: https://chromium-review.googlesource.com/443350
Reviewed-by: Kenneth Russell <1ebccd90c2bc76de65b6f830f2128a91ed69fdfb@chromium.org>
Commit-Queue: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools