Chrome OS version: 10718.58.0, 68.0.3440.70 beta channel coral devices

'cheets_Notification' test failure on coral boards

On Nasher360 board:

Stainless logs:
https://stainless.corp.google.com/search?view=list&first_date=2018-07-11&last_date=2018-07-25&owner=chromeos-test&waterfall=chromeos%28_release%7C%29&suite=%5CQbvt-arc%5CE&test=cheets_Notification&build=%5ER68%5C-10718%5C.58%5C.0%24&model=nasher360&status=FAIL&status=ERROR&status=ABORT&exclude_cts=false&exclude_not_run=false&exclude_non_release=true&exclude_au=false&exclude_acts=true&exclude_retried=false&exclude_non_production=false

Reason:
Dependency ArcNotificationTest-apk does not exist

On boards like Nasher, Astranaut:

Stainless logs: 
https://stainless.corp.google.com/search?view=list&first_date=2018-07-11&last_date=2018-07-25&owner=chromeos-test&waterfall=chromeos%28_release%7C%29&suite=%5CQbvt-arc%5CE&test=cheets_Notification&build=%5ER68%5C-10718%5C.58%5C.0%24&board=coral&status=FAIL&status=ERROR&status=ABORT&exclude_cts=false&exclude_not_run=false&exclude_non_release=true&exclude_au=false&exclude_acts=true&exclude_retried=false&exclude_non_production=false

Reason: 
Timed out waiting for condition: Notification is found