When there is no data to show, don't make a crazy collapsed chart.
Also avoid re-creating the chart when scrolling.
And fix various other things.
Change-Id: Ia1895bc7c46e6d830e66f66e66f17726e1e23e3f
Show packages included, time that a subsystem was on for.
Load label and icon in the background and cache the values.
Switch between totals and since-unplugged.
Other UI improvements.
