* Harden each of the major upgrade steps so any errors (e.g. NPE) are
caught and that account goes into error state.
* Make sure that any account in error state is abandoned properly - all
steps skipped except the final delete/cleanup.
* Bugfix: The variable that indicates that an account has gone into an
error state (upgrade failed) state was being set in the UI thread and
tested in the worker thread, so it was not properly stopping the
upgrade of any given account. Split that variable into two, one for the
UI thread (set/read by the handler) and one for the worker thread.
* Bugfix: Report errors against the correct account, when 2+ accounts are
being upgraded.
Bug: 2608483
Change-Id: I571078ae7123b601b53096104c4c5f4ef20da031
5d5d7854c2