Update rotate suggestion button icon+motion

Motion is dynamically set to match pending screen rotation through
styling. AVD bugs make consistently looping motion hard, looped instead
within AVD. Refactor some logic into NavBarFragment for simplicity.

Test: custom Gingerbread app with menu and IME, a11y manual toggling
Change-Id: I5a975785203aeaf46c36962be05cab6abdc628a1