Use child texture effects in ProcessorRefTest

Also remove unused buffers. FPs no longer support reading from buffers.

Bug: skia:10139

Change-Id: Id1e2d7ef2cfa7f11a95cb0ce448c69af755c2b65
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/297176
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed