SystemUI: Improve HeadsUp expanding performance.

Change-Id: Ifd31caca6d2eb2432772b6a63f6b545f8288f449
HeadsUp: post-bringup merge and bug fix

missed addHeadsUpView when recreating statusbar after theme change
this was cause the next HeadUpNotification to bring down SystemUI

proper touch focus handling in StatusBarWindow

Change-Id: Iab7cf5876a00cc66c58ed1edac430a3d699b8d95