Factory methods for heap-allocated SkPathEffect and SkXfermode objects.

src/effects/SkArithmeticMode.cpp

Index: src/effects/SkArithmeticMode.cpp
diff --git a/src/effects/SkArithmeticMode.cpp b/src/effects/SkArithmeticMode.cpp
index 052b06507c26a364d4c735c13a94718736ebdd7b..2121e3a81dadea597b4f21018e189152a8615425 100644
--- a/src/effects/SkArithmeticMode.cpp
+++ b/src/effects/SkArithmeticMode.cpp
@@ -23,11 +23,8 @@ static const bool gUseUnpremul = false;
 
 class SkArithmeticMode_scalar : public SkXfermode {
 public:
-    SkArithmeticMode_scalar(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4) {
-        fK[0] = k1;
-        fK[1] = k2;
-        fK[2] = k3;
-        fK[3] = k4;
+    static SkArithmeticMode_scalar* Create(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4) {
+        return SkNEW_ARGS(SkArithmeticMode_scalar, (k1, k2, k3, k4));
     }
 
     virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
@@ -41,6 +38,13 @@ public:
 #endif
 
 private:
+    SkArithmeticMode_scalar(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4) {
+        fK[0] = k1;
+        fK[1] = k2;
+        fK[2] = k3;
+        fK[3] = k4;
+    }
+
     SkArithmeticMode_scalar(SkReadBuffer& buffer) : INHERITED(buffer) {
         fK[0] = buffer.readScalar();
         fK[1] = buffer.readScalar();
@@ -216,7 +220,7 @@ SkXfermode* SkArithmeticMode::Create(SkScalar k1, SkScalar k2,
         return SkNEW_ARGS(SkArithmeticMode_linear, (i2, i3, i4));
 #endif
     }
-    return SkNEW_ARGS(SkArithmeticMode_scalar, (k1, k2, k3, k4));
+    return SkArithmeticMode_scalar::Create(k1, k2, k3, k4);
 }