Can't fold ctm and color matrix when in perspective

Will work on clipping in follow-up CL

Change-Id: I1e4cc485555a435c740a4e5b50445f21e9ec20c7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260404
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed