Convert binary unrolled gradient colorizer to GrSkSLFP

Change-Id: I28eb4479476a531a7b45fbef0ce9da72a4d29dc1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/423997
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/gm/analytic_gradients.cpp b/gm/analytic_gradients.cpp
index b2eac27..ebfd1e1 100644
--- a/gm/analytic_gradients.cpp
+++ b/gm/analytic_gradients.cpp
@@ -6,8 +6,8 @@
  */
 
 /*
- * This GM presents a variety of gradients meant to test the correctness of the analytic
- * GrUnrolledBinaryGradientColorizer, which can handle arbitrary gradients with 1 to 8 interpolation
+ * This GM presents a variety of gradients meant to test the correctness of the analytic unrolled
+ * binary gradient colorizer, which can handle arbitrary gradients with 1 to 8 interpolation
  * intervals. These intervals can be either hardstops or smooth color transitions.
  *
  * It produces an image similar to that of GM_hardstop_gradients, but is arranged as follows: