VT UX Cleanup

Fixing two issues:
1. Contact photo shows behind video surface.  Refactored logic in
VideoCallPresenter to determine if video surfaces are showing/hidden and
call this from CallCardPresenter in order to determine if the contact
photo should be visible.
2. With contact photo hidden, background activities show through instead.
Added a black background color to the incall_screen to solve this.

Bug: 21192340
Change-Id: I45a88ba47ffa80f25bcee5b8d4f8e9b0de04f602
4 files changed
tree: 572749486b418cf5cbdd57e5f82a6795a3a8ad5b
  1. InCallUI/