Don't show account access request UI until app launched.

Sync adapters that don't have account access cannot run until
the user explicitly approves in the UI. This is spammy given
the user may not use the app right away. This change doesn't
show the notificaiton until the app has run.

bug:31162498

Change-Id: I1f4f2d2e9426f78763590e8aa542b94d6e93e488