Factory methods for heap-allocated SkPathEffect and SkXfermode objects.

include/core/SkXfermode.h

Index: include/core/SkXfermode.h
diff --git a/include/core/SkXfermode.h b/include/core/SkXfermode.h
index 31b8081f85b0f05a2904f20d9ae22f07900634cd..40b251d1396a7624fc94a1914b962f14cfb01aac 100644
--- a/include/core/SkXfermode.h
+++ b/include/core/SkXfermode.h
@@ -32,8 +32,6 @@ class SK_API SkXfermode : public SkFlattenable {
 public:
     SK_DECLARE_INST_COUNT(SkXfermode)
 
-    SkXfermode() {}
-
     virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
                         const SkAlpha aa[]) const;
     virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
@@ -218,6 +216,7 @@ public:
     SK_DEFINE_FLATTENABLE_TYPE(SkXfermode)
 
 protected:
+    SkXfermode() {}
     SkXfermode(SkReadBuffer& rb) : SkFlattenable(rb) {}
 
     /** The default implementation of xfer32/xfer16/xferA8 in turn call this
@@ -250,7 +249,9 @@ private:
 */
 class SkProcXfermode : public SkXfermode {
 public:
-    SkProcXfermode(SkXfermodeProc proc) : fProc(proc) {}
+    static SkProcXfermode* Create(SkXfermodeProc proc) {
+        return SkNEW_ARGS(SkProcXfermode, (proc));
+    }
 
     // overrides from SkXfermode
     virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
@@ -276,6 +277,11 @@ protected:
         return fProc;
     }
 
+#ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
+public:
+#endif
+    SkProcXfermode(SkXfermodeProc proc) : fProc(proc) {}
+
 private:
     SkXfermodeProc  fProc;