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The pause app dialog and block app dialog are system type window, which
means once the dialog is opened, the user must click the OK to accept
it, and the user can't move to other windows or do another other things
on the Chromebook before he/she clicks the OK button.

Based on the discussion in 1056466, this CL is used to implement:
For app block:
1. When the app is blocked, no matter the app is running or not, we
won't show dialog, because it is Android controls the app running, and
AppService can't know whether the app is running or not, due to the
schedule issue. When AppService is notified about the app status
changed, the app has been stopped. So rollback the dialog show in arc
apps when the app status is changed.

2. After the app is blocked, when the app is clicked to launch, show the
app block dialog.

For app pause:
1. When Family link notifies AppService to pause app, AppService will
show the pause app based on the family link's parameter. If the
parameter is yes, then show the dialog, otherwise, don't show the
dialog. This has been implemented, so no change for this CL.

2. After the app is paused, when the app is clicked to launch, get the
latest time limit setting from family link, and show the app pause
dialog.

BUG=1056466

Change-Id: I2e9c5445f13820b63cca81954724bfed95c614be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2084033
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748467}