Fix issues with the new widget layout

Fix issues with the new widget layout

-> use first layout instead of first measure to determine size
-> fix issue where we were doubly accounting for padding of
   AppsCustomizePagedView
-> show page backgrounds by default, hide fake page by default
-> stripping some dead code related to the market button
   and all apps cling

Change-Id: I787bdf1092c821b780670098fb219a8a68914bc8