Support other values of pointer-events

[upsuper]

There are several other values we need to support for pointer-events in stylo, which are: visiblePainted visibleFill visibleStroke visible painted fill stroke.

Simply adding

extra_gecko_values="visiblePainted visibleFill visibleStroke visible painted fill stroke",

seems to hit an assertion

assertion failed: `(left == right)` (left: `"visiblePainted"`, right: `"visiblepainted"`): string patterns must be given in ASCII lowercase

which may need some investigation.

[highfive]

cc @emilio

[nox]

The spec doesn't seem to say whether these values are supposed to be case-sensitive or not.

[nox]

If they are not, we can just do:

extra_gecko_values="visiblepainted visiblefill visiblestroke visible painted fill stroke"

[upsuper]

Yeah, we can just do that. Although it would be better if we can serialize those values to the canonical form defined in the spec, but it seems Gecko is already serializing them to lowercase form, so it is probably fine to do this for now.

We may want to fix that eventually, but that's definitely not a priority.