It would grant the permission to the temporary ActivityRecord,
not the real one, so it never got cleaned up.
Also allow granting of permissions to services because... well,
it would be really really useful. And it introduces some
refactoring that we'll need to support cut/paste.
Change-Id: If521f509042e7baad7f5dc9bec84b6ba0d90ba09
Introdude a new ActivityStack class that holds all of the
state and management of a stack of activities. Paves the way
for having multiple activity stacks, though at this point
there should be no change in functionality and the activity
manager is still assuming there is only one stack.
Change-Id: Iea4859a24c9269061043755ec58a615028d4183b
