- Refactor some basic scrim logic to Scrim class and have
WorkspaceAndHotseatScrim and OverviewScrim extend it
- Draw OverviewScrim under recents unless predictions are disabled, in
which case draw it under hotseat (since that is in recents)
- Remove sysui scrim (behind status bar and nav bar) when overview is
peeking
Bug: 132455160
Change-Id: Ia5d6f54582a4c5a70e3b2d4a98281567edd68519