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

gm/modecolorfilters.cpp

 /*
  * Copyright 2012 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 "SkColorFilter.h"
 #include "SkGradientShader.h"
@@ skipping 60 matching lines @@
         constexpr int kRectWidth  = 20;
         constexpr int kRectHeight = 20;
 
         constexpr int kCheckSize  = 10;
 
         if (!fBmpShader) {
             fBmpShader = make_bg_shader(kCheckSize);
         }
         SkPaint bgPaint;
         bgPaint.setShader(fBmpShader);
-        bgPaint.setXfermodeMode(SkXfermode::kSrc_Mode);
+        bgPaint.setBlendMode(SkBlendMode::kSrc);
 
         sk_sp<SkShader> shaders[] = {
             nullptr,                                   // use a paint color instead of a shader
             make_solid_shader(),
             make_transparent_shader(),
             make_trans_black_shader(),
         };
 
         // used without shader
         SkColor colors[] = {
@@ skipping 57 matching lines @@
     sk_sp<SkShader> fBmpShader;
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ModeColorFilterGM; }
 static GMRegistry reg(MyFactory);
 
 }