Add flag to gradients to interpolate colors in premul space. Experimental API to encapsulate the sh…

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 51433afbca351eba0ecabb7bb2f29698ae41cf53..f975a1887ead036816bd2f190fd36cb8f76a6c5e 100644
--- a/src/effects/gradients/SkSweepGradient.cpp
+++ b/src/effects/gradients/SkSweepGradient.cpp
@@ -10,8 +10,8 @@
 
 SkSweepGradient::SkSweepGradient(SkScalar cx, SkScalar cy,
                                  const Descriptor& desc)
-: SkGradientShaderBase(desc),
-  fCenter(SkPoint::Make(cx, cy))
+    : SkGradientShaderBase(desc)
+    , fCenter(SkPoint::Make(cx, cy))
 {
     fPtsToUnit.setTranslate(-cx, -cy);