Ensure bubbles + pip dismiss view is above navbar

- Include the bottom nav inset when placing the dismiss
  view for bubbles + pip.
- Add a window inset listener in pip.
- Make sure a couple of res values were being updated
  in bubble's dismiss view.

Bug: 197119627
Test: manual - have a bubble & drag to dismiss
             - ensure the dismiss target is completely
               visible & above any navbar & changes
               if navbar visibility changes
Change-Id: Ib05e294eade874bbdbdd025d412d0841314f8d7d