The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6e7d1df6a24ad234579cccfe308bd6cdf6ca01f0

commit 6e7d1df6a24ad234579cccfe308bd6cdf6ca01f0
Author: James Cook <jamescook@chromium.org>
Date: Wed Apr 25 20:51:44 2018

cros: Remove ash access from consumer kiosk idle app notification

This is necessary for out-of-process ash (go/mustash). Eliminate a call
to ash::Shell::GetRootWindowForNewWindows(). The notification is only
shown if the primary display is an internal Chromebook display (existing
behavior) and it will now always appear on that display instead of
potentially appearing on a secondary, non-internal display.

Bug: 756082
Test: manual test on device
Change-Id: Id56a87b56fd2e51a215a2dfeecfaee2417549257
Reviewed-on: https://chromium-review.googlesource.com/1028576
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553734}
[modify] https://crrev.com/6e7d1df6a24ad234579cccfe308bd6cdf6ca01f0/chrome/browser/chromeos/app_mode/kiosk_mode_idle_app_name_notification.cc
[modify] https://crrev.com/6e7d1df6a24ad234579cccfe308bd6cdf6ca01f0/chrome/browser/chromeos/ui/idle_app_name_notification_view.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/36fade6abd290d8dab5952dc996cf466a8d9db6f

commit 36fade6abd290d8dab5952dc996cf466a8d9db6f
Author: James Cook <jamescook@chromium.org>
Date: Wed Apr 25 23:31:19 2018

cros: Always show kiosk usb update notification on primary display

This eliminates a call into ash::Shell::GetRootWindowForNewWindows,
which we need to do for out-of-process ash (go/mustash).

The existing code looks like it was just copied from another place
that shows a similar notification. Regardless, the primary display
should be fine.

Bug:  372857 ,  826569 
Test: browser_tests KioskUpdateTest.*
Change-Id: Iebe8a3a614bdb346fc30f8baab8b77e24ad466c2
Reviewed-on: https://chromium-review.googlesource.com/1029115
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553821}
[modify] https://crrev.com/36fade6abd290d8dab5952dc996cf466a8d9db6f/chrome/browser/chromeos/ui/kiosk_external_update_notification.cc