afohrman e566a535ac Ensure box background is drawn behind other text field elements.
This commit:
- Moves the draw calls in TextInputLayout#draw to happen in a better order: now, the background is drawn first, then TextInputLayout and its children, then the hint. This prevents the box from drawing on top of other text field elements.
- Updates box background setters and getters to modify boxBackgroundColor instead of defaultBoxBackgroundColor.
- Adds a demo for filled box background color changes to the text field demo.

PiperOrigin-RevId: 196748102
2018-05-16 11:48:54 -04:00
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