Fyodor Kupolov 4e8ce9ec4e Schedule backup of a package on a background thread
Scheduling involves writing to journal file. This part can be done on the
background thread in order to speed up the unlocking. Deferring writes to
journal file should be safe, because the system will reschedule backups in
case of a crash.

Bug: 29619732
Bug: 29645167
Change-Id: I0667ac2bf159e0f40b7a5066f41ea0841df98437
2016-07-06 18:20:29 -07:00
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