GitLab

Do not show the nudge unless the user has at least two (minimized)
app windows, so the user does not see empty overview UI.
Also, add an extra check that the nudges are not shown if the user
session is blocked.

BUG=1008963

Change-Id: I8a9b5380e011f0b84b3c5d76c24faf032931bc26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076449
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Manu Cornet <manucornet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745131}