GitLab

This fixes an issue where first-time users would not be flagged as such
if they simply closed the tab. Now, this is marked as soon as the UI is
shown.

Bug: b/168281605
Change-Id: Ifcb32d69536ed6f7c8f6acbf68e67287d62c0404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414170
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#807861}