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/tests/OnFlushCallbackTest.cpp b/tests/OnFlushCallbackTest.cpp
index 2088454..43b6549 100644
--- a/tests/OnFlushCallbackTest.cpp
+++ b/tests/OnFlushCallbackTest.cpp
@@ -476,7 +476,7 @@
 
         auto fp = GrTextureEffect::Make(atlasView, atlasAlphaType);
         GrPaint paint;
-        paint.addColorFragmentProcessor(std::move(fp));
+        paint.setColorFragmentProcessor(std::move(fp));
         paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
         std::unique_ptr<AtlasedRectOp> op(AtlasedRectOp::Make(context,
                                                               std::move(paint), r, start + i));
@@ -594,7 +594,7 @@
         GrPaint paint;
         auto fp = GrTextureEffect::Make(std::move(views[i]), kPremul_SkAlphaType, t);
         paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
-        paint.addColorFragmentProcessor(std::move(fp));
+        paint.setColorFragmentProcessor(std::move(fp));
 
         rtc->drawRect(nullptr, std::move(paint), GrAA::kNo, SkMatrix::I(), r);
     }