[svg] Skip "inherited" presentation attributes

Instead of propagating and attempting to handle at resolution time,
cull "inherited" values in the setters - for inherited-by-default
presentation attributes, "inherited" is the same as not specifying
a property.

Also add some missing setters for more consistent dispatching, and
assert that kInherited never shows up in computed values.

Change-Id: Iceeab4440c5c2eee18a144e2a32704fd29ec5e95
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/282396
Reviewed-by: Tyler Denniston <tdenniston@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
3 files changed