Darren Mo 2d6db967af Add properties to configure the border color/width of MDCShapedView.
`MDCShapedView` has properties to configure the elevation and shape generator but no properties to configure the border color/width. In order to do so, one must cast the view’s layer to `MDCShapedShadowLayer` and set its border color/width. (There is also no property exposing the underlying `MDCShapedShadowLayer`.)

PiperOrigin-RevId: 351710014
2021-01-13 18:52:22 -08:00
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