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

gm/lumafilter.cpp

Index: gm/lumafilter.cpp
diff --git a/gm/lumafilter.cpp b/gm/lumafilter.cpp
index 10eefabd5642ddc7c382a7bfbfe48e8138120be5..3852d9385f8c62a9b1ad14078698c9c311f29332 100644
--- a/gm/lumafilter.cpp
+++ b/gm/lumafilter.cpp
@@ -26,7 +26,7 @@ static void draw_label(SkCanvas* canvas, const char* label,
                      paint);
 }
 
-static void draw_scene(SkCanvas* canvas, const sk_sp<SkColorFilter>& filter, SkXfermode::Mode mode,
+static void draw_scene(SkCanvas* canvas, const sk_sp<SkColorFilter>& filter, SkBlendMode mode,
                        const sk_sp<SkShader>& s1, const sk_sp<SkShader>& s2) {
     SkPaint paint;
     paint.setAntiAlias(true);
@@ -53,7 +53,7 @@ static void draw_scene(SkCanvas* canvas, const sk_sp<SkColorFilter>& filter, SkX
     }
 
     SkPaint xferPaint;
-    xferPaint.setXfermodeMode(mode);
+    xferPaint.setBlendMode(mode);
     canvas->saveLayer(&bounds, &xferPaint);
 
     r = bounds;
@@ -101,13 +101,14 @@ protected:
     }
 
     void onDraw(SkCanvas* canvas) override {
-        SkXfermode::Mode modes[] = { SkXfermode::kSrcOver_Mode,
-                                     SkXfermode::kDstOver_Mode,
-                                     SkXfermode::kSrcATop_Mode,
-                                     SkXfermode::kDstATop_Mode,
-                                     SkXfermode::kSrcIn_Mode,
-                                     SkXfermode::kDstIn_Mode,
-                                   };
+        SkBlendMode modes[] = {
+            SkBlendMode::kSrcOver,
+            SkBlendMode::kDstOver,
+            SkBlendMode::kSrcATop,
+            SkBlendMode::kDstATop,
+            SkBlendMode::kSrcIn,
+            SkBlendMode::kDstIn,
+        };
         struct {
             const sk_sp<SkShader>& fShader1;
             const sk_sp<SkShader>& fShader2;