New option for arithmetic mode

gm/xfermodeimagefilter.cpp

Index: gm/xfermodeimagefilter.cpp
diff --git a/gm/xfermodeimagefilter.cpp b/gm/xfermodeimagefilter.cpp
index 2b14f4dfaab25d062e58881c72bf41d20218094a..e342a5e3845f220af96a1b006a03e1895bd6362b 100644
--- a/gm/xfermodeimagefilter.cpp
+++ b/gm/xfermodeimagefilter.cpp
@@ -8,6 +8,7 @@
 #include "gm.h"
 #include "SkArithmeticMode.h"
 #include "SkOffsetImageFilter.h"
+#include "SkValidateImageFilter.h"
 #include "SkXfermodeImageFilter.h"
 #include "SkBitmapSource.h"
 
@@ -143,8 +144,9 @@ protected:
             }
         }
         // Test arithmetic mode as image filter
-        SkAutoTUnref<SkXfermode> mode(SkArithmeticMode::Create(0, SK_Scalar1, SK_Scalar1, 0));
-        SkAutoTUnref<SkImageFilter> filter(SkXfermodeImageFilter::Create(mode, background));
+        SkAutoTUnref<SkXfermode> mode(SkArithmeticMode::Create(0, SK_Scalar1, SK_Scalar1, 0, false));
+        SkAutoTUnref<SkImageFilter> xferFilter(SkXfermodeImageFilter::Create(mode, background));
+        SkAutoTUnref<SkImageFilter> filter(SkValidateImageFilter::Create(xferFilter));
         paint.setImageFilter(filter);
         drawClippedBitmap(canvas, fBitmap, paint, x, y);
         x += fBitmap.width() + MARGIN;