Limit window display frame to size of containing stack

Some widgets like the PopupWindow use the display frame from
WindowManager to figure-out where to place content. We want to
limit the size of the display frame to the containing stack in
a multi-window environment so widgets and apps don't place
contents outside the containing stack of the window.

Bug: 19225079
Bug: 19286146
Change-Id: I58e2db47f6696260d7641cf5d588c4f2db6aff5a