0b071a08d8
Add view ID information to the assist structure. Also rework the API to simplify how it works by removing the ViewNode wrapper around ViewNodeImpl -- these are now just the same thing. And then add complexity by introducing a formal WindowNode object that contains the top-level window information (so I can add in some more window-specific info in the future). Change-Id: I5d525cf61ab6a73193e5cceb4c09d2d21cc27bae