9d5f8e11e1
bu is used by adb backup/restore, but since flags passed to these adb commands are just forwarded to bu, we have no guarantee that the help text for adb shows an up to date description of what bu can do. We therefore add the help text to bu, such that it is easier to keep in sync. Test: adb shell bu help Bug: 36170696 Change-Id: I8155d17b5c942ce19b981f4a157e7cc7810490ce