Rework progressbar according to AOSP, this should fix various
issues with progressbar.
From AOSP:
progress <frac> <secs>
fill up the next <frac> part of of the progress bar over <secs> seconds. If <secs> is
zero, use `set_progress` commands to manually control the progress of this segment of the
bar.
set_progress <frac>
<frac> should be between 0.0 and 1.0; sets the progress bar within the segment defined by
the most recent progress command.
Change-Id: I7f92359046288f3529cb2e98e6d54d410a248f1d
(cherry picked from commit ab16437de14fd9f1203b7e0ce82ea18eb56cae78)
d5364a0b21