Setting correct height for search bar widget options bundle.

- Seperate search bar height from its top and bottom paddings
- Report this height plus 8dps top and bottom for the widget options
- Use a separate bottom padding to adjust spacing between QSB and
  the workspace
- Add tests to verify the height of the search bar in both normal and
  tall modes (ran on Nexus 6, 7, and 10)
Change-Id: Ia7557785d1b38194eee869d0460456e8f33447d5