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

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index e0f216c220fad8bd74c6a53dcf3e7c92e629ebfc..4bc697d9047c425889a6900307d4b5014a9122e5 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -62,13 +62,8 @@ static void pts_to_unit_matrix(const SkPoint pts[2], SkMatrix* matrix) {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkLinearGradient::SkLinearGradient(const SkPoint pts[2],
-                                   const SkColor colors[],
-                                   const SkScalar pos[],
-                                   int colorCount,
-                                   SkShader::TileMode mode,
-                                   SkUnitMapper* mapper)
-    : SkGradientShaderBase(colors, pos, colorCount, mode, mapper)
+SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc)
+    : SkGradientShaderBase(desc)
     , fStart(pts[0])
     , fEnd(pts[1]) {
     pts_to_unit_matrix(pts, &fPtsToUnit);