Binding on-demand #5: PerformUnifiedRestoreTask usage

Migrate restore flow and related.

Change-Id: Ib61863e401067d7d4a9669982be8b3d87af0caa2
Ref: http://go/br-binding-on-demand
Bug: 17140907
Test: adb shell bmgr restore <set> <package> and observed logs
Test: adb shell bmgr restore <set> and observed logs
Test: Backed-up and re-installed app, observing logs
Test: gts-tradefed run commandAndExit gts-dev -m GtsBackupTestCases
Test: gts-tradefed run commandAndExit gts-dev -m GtsBackupHostTestCases
Test: cts-tradefed run commandAndExit cts-dev -m CtsBackupTestCases
Test: Looking into adding GTS/CTS for restore scenarios