Merge "API review feedback for ProgressBar" into nyc-dev am: 5500bb1d6d am: c27d18d681
am: ad93cf6938

* commit 'ad93cf693857f10b8f159b8583bd687266ea55d5':

Change-Id: Ic4e4968f66c0ad85e4e3041b7dfceae326fe2f97