Only set mResizedWhileNotDragResizing for base windows.

Dialogs, etc, may appear to not be drag resizing as they are not base
windows. Still though, when they resize we don't want them to enter
in to this mResizedWhileNotDragResizing mode or we will freeze
surface boundary updates and lose the ability to crop them to the stack.

Bug: 26668339
Change-Id: Id603816cf5f33b281f46c7812779ba29a024f34f