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/GrYUVProvider.cpp b/src/gpu/GrYUVProvider.cpp
index 14b177c..ca7dc6b 100644
--- a/src/gpu/GrYUVProvider.cpp
+++ b/src/gpu/GrYUVProvider.cpp
@@ -181,7 +181,7 @@
             GrColorSpaceXformEffect::Make(std::move(yuvToRgbProcessor),
                                           srcColorSpace, kOpaque_SkAlphaType,
                                           dstColorSpace, kOpaque_SkAlphaType);
-    paint.addColorFragmentProcessor(std::move(colorConversionProcessor));
+    paint.setColorFragmentProcessor(std::move(colorConversionProcessor));
 
     paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     const SkRect r = SkRect::MakeIWH(yuvSizeInfo.fSizes[0].fWidth,