- Moving to a couple piecewise curves to define the various overview
layout states. Added a new state for focus (to be used in follow up
CL) to control paging of overview from the nav bar button. This
allows us to control the visible range of items on the curve, and
to better fit other UI controls around the stack.
- Removed the scaling of the tasks in the stack
- Also refactoring parametric curve to just use the system Path
Change-Id: I4108da77986d86896576e36fa8f31189d6fcb6f3
4993c2f17e