GitLab

Add UKM for time before a popup is closed and whether it was closed due to
user gesture or not.

Bug: 825875
Change-Id: I9cd9abf40ee11c8404c7629b62cbdadc6b4069c9
Reviewed-on: https://chromium-review.googlesource.com/1005317
Commit-Queue: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551342}