* Workaround for (HTC bug 2275383) & (Moto bug 2226582)
* Adds checkpoints for backing up and restoring accounts
* Uses legacy Account / prefs to back up accounts - this is because
some of this code will be reused for legacy account migration
* Unit tests of Account & LegacyConversions
* Unit tests of backup & restore
* Not done: testing of EAS/Account Manager interface (this will require
deeper dependency injection, to avoid the embedded calls to the Account
Manager and other system services.)
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