afohrman eaee8cf2bf Add helper text attribute.
Also update the demo text fields so that their helper text is set via the attribute, instead of programmatically.

This commit also introduces some new methods in IndicatorViewController to provide symmetry with error text and abstract out some code that could be used for both error and helper text.

PiperOrigin-RevId: 174038374
2017-11-14 14:22:32 -05:00
..