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

src/effects/gradients/SkSweepGradient.h

Index: src/effects/gradients/SkSweepGradient.h
diff --git a/src/effects/gradients/SkSweepGradient.h b/src/effects/gradients/SkSweepGradient.h
index d57242989dcd745a68b550c5088b8556c276537f..8b685bc20936bd2fb631a442aa1ba3ad279083b6 100644
--- a/src/effects/gradients/SkSweepGradient.h
+++ b/src/effects/gradients/SkSweepGradient.h
@@ -13,8 +13,7 @@
 
 class SkSweepGradient : public SkGradientShaderBase {
 public:
-    SkSweepGradient(SkScalar cx, SkScalar cy, const SkColor colors[],
-                   const SkScalar pos[], int count, SkUnitMapper* mapper);
+    SkSweepGradient(SkScalar cx, SkScalar cy, const Descriptor&);
     virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
     virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) SK_OVERRIDE;