New dpi change method

Summary: Needed by the commits in frameworks/base and cfx vendor.

Test Plan: Fixes density wizard behavior.

Reviewers: randall.rushing, Mustaavalkosta, michyprima, Roach, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D231
UI controllers for status bars

Summary:
Clocks and batteries mostly. Just framework
for manipulating various views. Highly robust
and scalable

Test Plan: WIP, should be stable

Reviewers: randall.rushing, synergy, RaymanFX

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D255