Factory methods for heap-allocated SkPathEffect and SkXfermode objects.

include/effects/SkAvoidXfermode.h

Index: include/effects/SkAvoidXfermode.h
diff --git a/include/effects/SkAvoidXfermode.h b/include/effects/SkAvoidXfermode.h
index afc3fc9d7009e572537d3aa5410bd29a2edb4c84..a87eee5e475e3cb337594a28427d98d1d9e2af5e 100644
--- a/include/effects/SkAvoidXfermode.h
+++ b/include/effects/SkAvoidXfermode.h
@@ -37,7 +37,9 @@ public:
                 Tolerance near 0: draw only on colors that are nearly identical to the op-color
                 Tolerance near 255: draw on any colors even remotely similar to the op-color
      */
-    SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
+    static SkAvoidXfermode* Create(SkColor opColor, U8CPU tolerance, Mode mode) {
+        return SkNEW_ARGS(SkAvoidXfermode, (opColor, tolerance, mode));
+    }
 
     // overrides from SkXfermode
     virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
@@ -51,6 +53,7 @@ public:
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkAvoidXfermode)
 
 protected:
+    SkAvoidXfermode(SkColor opColor, U8CPU tolerance, Mode mode);
     SkAvoidXfermode(SkReadBuffer&);
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;