Exclude Smartspace viewpager from ChangeBounds transition and set.

The viewpager scrolls unnecessarily and sluggishly, when its horizontal
size updates with the transition. The issue is shown in the video in
http://281620564#comment1.

Fix: 281620564
Test: Follow steps to reproduce on the bug
Change-Id: I75b0d9cee80bfb567a082075c8bd8d822a96d1ca