GitLab

Notifications can be disabled for a number of
reasons. This logs those reasons with UMA.

Bug: 734095
Change-Id: I05e61b287312a42707d78415d2186909fae87fb7
Reviewed-on: https://chromium-review.googlesource.com/980559Reviewed-by: Xi Cheng <chengx@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546174}