Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

gm/dstreadshuffle.cpp

Index: gm/dstreadshuffle.cpp
diff --git a/gm/dstreadshuffle.cpp b/gm/dstreadshuffle.cpp
index 47c70563b5388f23956f53258e8689d29f791b0e..72a68b1d9dcf72b3befe6e2d2e533778766d8514 100644
--- a/gm/dstreadshuffle.cpp
+++ b/gm/dstreadshuffle.cpp
@@ -159,8 +159,8 @@ protected:
                             p.setColor(color);
                             // In order to get some batching on the GPU backend we do 2 src over for
                             // each xfer mode which requires a dst read
-                            p.setXfermodeMode(r % 3 == 0 ? SkXfermode::kLighten_Mode :
-                                                           SkXfermode::kSrcOver_Mode);
+                            p.setBlendMode(r % 3 == 0 ? SkBlendMode::kLighten :
+                                                        SkBlendMode::kSrcOver);
                             SetStyle(&p, style, width);
                             canvas->save();
                             canvas->translate(x, y);