GitLab

Basically it's just a copy of the Tests above for AddPendingExtension,
with additional test that there is a version set in the request.

Bug: 959140
Change-Id: Icc49a4c391ad1e6de7e1bb8cc3beed416ec7159c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611892Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Askar Aitzhan <askaraitzhan@google.com>
Cr-Commit-Position: refs/heads/master@{#659509}