Factory methods for heap-allocated SkPathEffect and SkXfermode objects.

include/effects/SkPixelXorXfermode.h

Index: include/effects/SkPixelXorXfermode.h
diff --git a/include/effects/SkPixelXorXfermode.h b/include/effects/SkPixelXorXfermode.h
index 9472d9426e3ba00e83585a725129034d6eb0a5f3..cfd59ecce010d1395b60208f9d3ed0345454e0b8 100644
--- a/include/effects/SkPixelXorXfermode.h
+++ b/include/effects/SkPixelXorXfermode.h
@@ -17,7 +17,9 @@
 */
 class SK_API SkPixelXorXfermode : public SkXfermode {
 public:
-    SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
+    static SkPixelXorXfermode* Create(SkColor opColor) {
+        return SkNEW_ARGS(SkPixelXorXfermode, (opColor));
+    }
 
     SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
@@ -29,6 +31,11 @@ protected:
     // override from SkXfermode
     virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const;
 
+#ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
+public:
+#endif
+    SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
+
 private:
     SkColor fOpColor;