(Some) gradients are gamma and gamut correct on GPU

src/effects/gradients/SkSweepGradient.cpp

Index: src/effects/gradients/SkSweepGradient.cpp
diff --git a/src/effects/gradients/SkSweepGradient.cpp b/src/effects/gradients/SkSweepGradient.cpp
index 07892370487437268b59e40b7d3a8be9d4300d82..58bb8aa8ed54fcdbbbe7d36420acb76cb4f535a7 100644
--- a/src/effects/gradients/SkSweepGradient.cpp
+++ b/src/effects/gradients/SkSweepGradient.cpp
@@ -247,8 +247,11 @@ sk_sp<GrFragmentProcessor> SkSweepGradient::asFragmentProcessor(const AsFPArgs&
     }
     matrix.postConcat(fPtsToUnit);
 
+    sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(fColorSpace.get(),
+                                                                       args.fDstColorSpace);
     sk_sp<GrFragmentProcessor> inner(GrSweepGradient::Make(
-        GrGradientEffect::CreateArgs(args.fContext, this, &matrix, SkShader::kClamp_TileMode)));
+        GrGradientEffect::CreateArgs(args.fContext, this, &matrix, SkShader::kClamp_TileMode,
+                                     std::move(colorSpaceXform), SkToBool(args.fDstColorSpace))));
     return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
 }