With only four LED segments, it's confusing to indicate a power
percentage by dimming the top segment unless you can see the
indicator smoothly ramping up from all-off. This does that.
Kind of pretty, if I say so myself.
BUG=chrome-os-partner:29041
BRANCH=ToT, Samus
TEST=make buildall
Run "ectool lightbar demo on", then press the T key to invoke the
pattern and the arrow keys to fake the charge state.
Change-Id: Ib6a56aea56078b8c1fc9edddda469d7f41735ff7
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/223300
Reviewed-by: Alec Berg <alecaberg@chromium.org>