Set an app's state:
pm set-app-link [--user USER_ID] PACKAGE {always|ask|never|undefined}
Read an app's current state:
pm get-app-link [--user USER_ID] PACKAGE
The latter prints to stdout one of the strings usable as an argument to
set-app-link. If an error is encountered, the string printed to
stderr begins with "Error: ".
Bug 19628527
Change-Id: I68b6dc24445917807345a8cf5baa2078490740af
387225ff01