use Descriptor struct to encapsulate all the common paramaeters between our various gradient types.…

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 1e6b642260c1799e2f3e1cd03901de48ffbde25e..51433afbca351eba0ecabb7bb2f29698ae41cf53 100644
--- a/src/effects/gradients/SkSweepGradient.cpp
+++ b/src/effects/gradients/SkSweepGradient.cpp
@@ -8,12 +8,15 @@
 
 #include "SkSweepGradient.h"
 
-SkSweepGradient::SkSweepGradient(SkScalar cx, SkScalar cy, const SkColor colors[],
-               const SkScalar pos[], int count, SkUnitMapper* mapper)
-: SkGradientShaderBase(colors, pos, count, SkShader::kClamp_TileMode, mapper),
+SkSweepGradient::SkSweepGradient(SkScalar cx, SkScalar cy,
+                                 const Descriptor& desc)
+: SkGradientShaderBase(desc),
   fCenter(SkPoint::Make(cx, cy))
 {
     fPtsToUnit.setTranslate(-cx, -cy);
+
+    // overwrite the tilemode to a canonical value (since sweep ignores it)
+    fTileMode = SkShader::kClamp_TileMode;
 }
 
 SkShader::BitmapType SkSweepGradient::asABitmap(SkBitmap* bitmap,