Summary: Aphront widgets that render the either a discrete or continuous value as a horizontal shape. Like a progress bar, or a five-star rating bar.
Test Plan:
`/uiexample/view/PhabricatorAphrontBarExample/` ...which shows this, amongst other things:
{F33898}
Reviewers: epriestley, chad
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2094
Differential Revision: https://secure.phabricator.com/D5122
