Remove support for multiple color processors from GrPaint.

Change-Id: Ia92dc2be9a25f334bdbc098564cf2332496677fa
Bug: skia:10217
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/304296
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
diff --git a/tests/ProgramsTest.cpp b/tests/ProgramsTest.cpp
index 4bb9485..fba33ea 100644
--- a/tests/ProgramsTest.cpp
+++ b/tests/ProgramsTest.cpp
@@ -233,7 +233,7 @@
         }
     } else {
         int numProcs = d->fRandom->nextULessThan(maxStages + 1);
-        int numColorProcs = d->fRandom->nextULessThan(numProcs + 1);
+        int numColorProcs = 1;
 
         for (int s = 0; s < numProcs; ++s) {
             std::unique_ptr<GrFragmentProcessor> fp(GrFragmentProcessorTestFactory::Make(d));