Fix status bar brightness control when on secure lock screen

When the notifications panel is disabled no views are handling touch events
on the status bar, so we see nothing beyond each ACTION_DOWN. Intercept touch
events when needed specifically for brightness control.

Also recycle VelocityTracker when we're not using it, as per its documentation.

Change-Id: I84d4c788bcdb1e05244710aca933d97e3e60d1b5
Navbar: Fix MDPI & HDPI landscape layout

Before: http://i.imgur.com/89SmFbX.png
After: http://i.imgur.com/UbuAggD.png

Change-Id: I6623cb97881313886de39a67baa98f7bd4b0696a
Merge "Fix status bar brightness control when on secure lock screen" into cm-10.1
Merge "Navbar: Fix MDPI & HDPI landscape layout" into cm-10.1
Merge remote-tracking branch 'cyanogen/cm-10.1' into cm-10.1