Support all gradient types in SkColorSpaceXformCanvas.

This shader introspection still doesn't seem like the right way to go,
but while we've got it might as well fill in the rest of gradient types.

These are low-hanging and among the most egregious gbr-8888/8888 diffs.

Change-Id: Iaee67b615e49873c3aa8e2a67396a311efa75060
Reviewed-on: https://skia-review.googlesource.com/9746
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed