When an activity is moved to a stack using the
ActivityStack#moveActivityToStack API a new task is created to
hold the activity in the stack. However, when the new task is
created in the window manager side it uses the stack id of the
previous stack the activity was in. We now pass the stack to use
from activity manager to window manager.
Bug: 25987309
Bug: 25961636
Change-Id: Iecc71f6d9b3e70a8d88e134b42f7532ba5327bad
2998eef694