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

src/effects/gradients/SkTwoPointRadialGradient.cpp

Index: src/effects/gradients/SkTwoPointRadialGradient.cpp
diff --git a/src/effects/gradients/SkTwoPointRadialGradient.cpp b/src/effects/gradients/SkTwoPointRadialGradient.cpp
index f70b67d47953910544e12dbbaf9d7d3378328cd3..989c1395563145122a0f13e88a5822011adcbd83 100644
--- a/src/effects/gradients/SkTwoPointRadialGradient.cpp
+++ b/src/effects/gradients/SkTwoPointRadialGradient.cpp
@@ -170,10 +170,8 @@ void shadeSpan_twopoint_repeat(SkScalar fx, SkScalar dx,
 SkTwoPointRadialGradient::SkTwoPointRadialGradient(
     const SkPoint& start, SkScalar startRadius,
     const SkPoint& end, SkScalar endRadius,
-    const SkColor colors[], const SkScalar pos[],
-    int colorCount, SkShader::TileMode mode,
-    SkUnitMapper* mapper)
-    : SkGradientShaderBase(colors, pos, colorCount, mode, mapper),
+    const Descriptor& desc)
+    : SkGradientShaderBase(desc),
       fCenter1(start),
       fCenter2(end),
       fRadius1(startRadius),