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Child user will see the notification with the details of time
limit change in the following cases:
* App did not have the limit and new limit was set.
* App had time limit set and it was removed.
* The value of time limit changed.
There are no notifications displayed for web apps, as they
share the limit with Chrome and notification will be shown
for Chrome.

Bug: 1052011
Test: AppTimeControllerTest
Change-Id: I662773969b4668c73bc3d6a9d572f8a11d147ae7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065411Reviewed-by: Yilkal Abe <yilkal@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743117}