tree 9be6a0af0b33e7dc152f9b8ab4445af40ffbd998
parent 0c2d9b0f3e65fefc74520479d963613055ef6ccf
author Tony Mak <tonymak@google.com> 1511868849 +0000
committer Tony Mak <tonymak@google.com> 1511869803 +0000

Preserve tab position

To reproduce the issue:
1. Swipe to work tab
2. Tap Home
3. Swipe up to show all apps, you can see the personal tab is
   highlighted while the view pager is showing work apps.

We cleared the state whenever onLayout is called, we should
make use of mSelectedPosition.

Change-Id: I621b3c9ada0eb608280fe5e4ea8715f3a341820d