GitLab

Add this metric to help us understand usage and plan
improvements.

Bug: 1099338
Change-Id: I77ce043b2e54031b8c35d8ba302be8b7b254edcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424508
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811925}