RippleDrawable on different API levels will modulate the alphas differently
for the pressed / focused / hovered states. Therefore, in order to get the
desired alphas for pressed / focused / hovered states, we are using the
mtrl_low_ripple_(pressed|focused|hovered|default)_alpha values which have
been defined to account for the different implementations of RippleDrawable.
PiperOrigin-RevId: 254737730