Keeing the device in gesture nav while user setup is pending

> Sending different insets to the app during user setup
> Keeping the back butotn visible and not handling edge swipe
> Fixing bug where EdgeBackGestureHandler is not updated with correct
  edge scale when user switches

Bug: 150004073
Bug: 148492421
Test: Manual
Change-Id: I112465a634de2c85d613c071b66f8c099c2c78e3