Accessibility focus traversal of lists inconsistent.

1. Now the list traversal forward is the exact opposite
   of the traversal backward.

2. The focus search starts from the view against which
   the call is made as opposed to the one that has focus.
   This is now consistent with the rest of the focus search.

bug:6537747

Change-Id: Ida6a696636a3099531155fcbff256f71264f5008