afohrman 2463946d24 [TextInputLayout] Add line mask expansion animation to filled box underline.
Add an expanding animation for the focused underline that's triggered when the edit text gains focus. The line mask animation is built to calculate its bounds based on the hint CollapsingTextHelper's expansion fraction, so it seamlessly follows that animation.

PiperOrigin-RevId: 424703815
2022-01-28 11:55:08 -08:00
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