Implement VABCPartitionWriter am: 9b10dba459 am: bdff4aa6d9 am: 0b034b6e6f

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1439295

Change-Id: Ie825fda23da1745c9e0a31d2d7ed7900582131b6