This fixes recents to freeform activities animation problem when the
activities where previously in a non-freeform stack. Their stack id
still reports fullscreen, even though they will enter freeform. Because
of this we need to pass the target stack id with the call that creates
animation spec.
Bug: 24814340
Change-Id: Iea589d458c29c3644f351b29f51e8f8cfb5f90e3
f48b585725