Binding on-demand #4: PerformClearTask usage

Migeate the clear flow.

Change-Id: Id268f772ae0f7a88b3e060c9597d777e0b73121a
Ref: http://go/br-binding-on-demand
Bug: 17140907
Test: adb shell bmgr wipe <transport> <package> and observed 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