afohrman 2cf2cfd90e Add structure for text field demos and split demos into filled and outline demos.
Create base classes for text field demos to unify shared logic and handle optionally controllable text field demos. This new structure is used to split the text field demo into filled and outline controllable demos.

This commit also contains some cleanup for text field demos in general (removes an extra string, converts anonymous listeners to lambdas, etc.)

PiperOrigin-RevId: 196999248
2018-05-17 19:44:01 -04:00
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