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

gm/colormatrix.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkColorMatrixFilter.h"
 #include "SkGradientShader.h"
@@ skipping 59 matching lines @@
         paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
                                                      SkShader::kClamp_TileMode));
         canvas.drawRect(SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height)), paint);
         return SkImage::MakeFromBitmap(bm);
     }
 
     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         SkColorMatrix matrix;
 
-        paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+        paint.setBlendMode(SkBlendMode::kSrc);
         const SkImage* bmps[] = { fSolidImg.get(), fTransparentImg.get() };
 
         for (size_t i = 0; i < SK_ARRAY_COUNT(bmps); ++i) {
             matrix.setIdentity();
             set_color_matrix(&paint, matrix);
             canvas->drawImage(bmps[i], 0, 0, &paint);
 
             matrix.setRotate(SkColorMatrix::kR_Axis, 90);
             set_color_matrix(&paint, matrix);
             canvas->drawImage(bmps[i], 80, 0, &paint);
@@ skipping 47 matching lines @@
         }
     }
 
 private:
     sk_sp<SkImage>   fSolidImg;
     sk_sp<SkImage>   fTransparentImg;
 
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new ColorMatrixGM; )