[svg] Convert stop-color and stop-opacity to presentation attrs
These are somewhat the first presentation attributes of their kind,
in that they are non-inherited but also not applied via canvas layers.
Implementation-wise the main difference is that these attributes are
not propagated through the fInherited field of the render context's
presentation attribute list.
Change-Id: I0909507b0ecbd21732b3f80c46a343f5a0a9bf7a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/340661
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Tyler Denniston <tdenniston@google.com>
11 files changed
