Updating UI to new design, widget shouldn't expand until page settles (issue 7467435)

-> If the challenge is showing and the page is swiped, instead of immediately
   sliding down the security and expanding the small widget, we instead
   quickly fade out the security and keep the widget+frame small until
   the page settles and fades out.

Change-Id: I0f376dcd863744b977a1c5ccc7a46a5c6fdb891d