GitLab

This CL adds a histogram to keep track of which kind of issues are
created.

Frontend CL: https://crrev.com/c/2567967

Change-Id: Ifc906076fad1c8f2925953366d4791edc7ca2a87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574985Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Wolfgang Beyer <wolfi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836569}