When ENABLE_OVERVIEW_ACTIONS flag is enabled, swiping up from the nav
bar goes to overview if you hold, or the first home screen if you don't.
- Added NoButtonNavBarToOverviewTouchController, which extends
FlingAndHoldTouchController but only works if you start from the nav
bar. Otherwise it falls back to PortraitStatesTouchController to
handle normal state transition to all apps.
- Added HintState. This is where the workspace/hotseat/qsb scale down
when you swipe up from the nav bar, to hint that you're about to
either go to overview or the first home screen.
- Added getQsbScaleAndTranslation() to allow Overview and Hint states
to treat it as part of the hotseat.
- Since Overview needs to show above the QSB as it's animating, bring
Overview to the front and update OverviewScrim to handle the case
where there's no view above Overview to draw the scrim beneath.
- ENABLE_OVERVIEW_ACTIONS is always false in 2-button mode, since the
shelf is crucial to that mode.
Bug: 143361609
Change-Id: I743481bb239dc77f7024dc98ba68a43534da2637
- 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
