GitLab

Add the test arg to iOS code coverage runner so that iOS disabled tests
will be written to a file, parsed in test runner and reported to result
json file. Use coverage builder as this is relative static information
that's suitable to run on coverage CI builder.
Note: This arg currently only works for outputting disabled GTests.

Bug: 1065022
Change-Id: I6481e271b970397829f0f8301bd1089c7a0a6076
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364029Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800359}