Bundle common arguments to GrGradientEffect creation

src/effects/gradients/SkGradientShaderPriv.h

Index: src/effects/gradients/SkGradientShaderPriv.h
diff --git a/src/effects/gradients/SkGradientShaderPriv.h b/src/effects/gradients/SkGradientShaderPriv.h
index ee30c9b21b03fc5f9a69dbdb13e224418c132981..ec70929d43a6e663a68f11f5349959407986f50d 100644
--- a/src/effects/gradients/SkGradientShaderPriv.h
+++ b/src/effects/gradients/SkGradientShaderPriv.h
@@ -323,12 +323,25 @@ class GrInvariantOutput;
 // Base class for Gr gradient effects
 class GrGradientEffect : public GrFragmentProcessor {
 public:
+    struct CreateArgs {
+        CreateArgs(GrContext* context,
+                   const SkGradientShaderBase* shader,
+                   const SkMatrix* matrix,
+                   SkShader::TileMode tileMode)
+            : fContext(context)
+            , fShader(shader)
+            , fMatrix(matrix)
+            , fTileMode(tileMode) {}
+
+        GrContext*                  fContext;
+        const SkGradientShaderBase* fShader;
+        const SkMatrix*             fMatrix;
+        SkShader::TileMode          fTileMode;
+    };
+
     class GLSLProcessor;
 
-    GrGradientEffect(GrContext* ctx,
-                     const SkGradientShaderBase& shader,
-                     const SkMatrix& matrix,
-                     SkShader::TileMode tileMode);
+    GrGradientEffect(const CreateArgs&);
 
     virtual ~GrGradientEffect();