Update GrPaint APIs to reflect lack of multiple color processors.

Change-Id: Ic7799b3c5f4294cba9ff72f8c11a2ad285ab189f
Bug: skia:10217
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/304738
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/ops/GrTextureOp.cpp b/src/gpu/ops/GrTextureOp.cpp
index 9ec2f26..b3b32b7 100644
--- a/src/gpu/ops/GrTextureOp.cpp
+++ b/src/gpu/ops/GrTextureOp.cpp
@@ -1073,7 +1073,7 @@
         if (saturate == GrTextureOp::Saturate::kYes) {
             fp = GrClampFragmentProcessor::Make(std::move(fp), /*clampToPremul=*/false);
         }
-        paint.addColorFragmentProcessor(std::move(fp));
+        paint.setColorFragmentProcessor(std::move(fp));
         return GrFillRectOp::Make(context, std::move(paint), aaType, quad);
     }
 }