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..bf147370ec9a3880d8ba893b7b9331ba1117d8d2 100644
--- a/include/effects/SkPixelXorXfermode.h
+++ b/include/effects/SkPixelXorXfermode.h
@@ -17,12 +17,15 @@
 */
 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)
 
 protected:
+    SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
     SkPixelXorXfermode(SkReadBuffer& rb);
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;