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

gm/srcmode.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 "SkCanvas.h"
 #include "SkGradientShader.h"
@@ skipping 64 matching lines @@
         canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
 
         SkPaint paint;
         sk_tool_utils::set_portable_typeface(&paint);
         paint.setColor(0x80F60000);
 
         const Proc procs[] = {
             draw_hair, draw_thick, draw_rect, draw_oval, draw_text
         };
 
-        const SkXfermode::Mode modes[] = {
-            SkXfermode::kSrcOver_Mode, SkXfermode::kSrc_Mode, SkXfermode::kClear_Mode
+        const SkBlendMode modes[] = {
+            SkBlendMode::kSrcOver, SkBlendMode::kSrc, SkBlendMode::kClear
         };
 
         const PaintProc paintProcs[] = {
             identity_paintproc, gradient_paintproc
         };
 
         for (int aa = 0; aa <= 1; ++aa) {
             paint.setAntiAlias(SkToBool(aa));
             canvas->save();
             for (size_t i = 0; i < SK_ARRAY_COUNT(paintProcs); ++i) {
                 paintProcs[i](&paint);
                 for (size_t x = 0; x < SK_ARRAY_COUNT(modes); ++x) {
-                    paint.setXfermodeMode(modes[x]);
+                    paint.setBlendMode(modes[x]);
                     canvas->save();
                     for (size_t y = 0; y < SK_ARRAY_COUNT(procs); ++y) {
                         procs[y](canvas, paint);
                         canvas->translate(0, H * 5 / 4);
                     }
                     canvas->restore();
                     canvas->translate(W * 5 / 4, 0);
                 }
             }
             canvas->restore();
@@ skipping 25 matching lines @@
         surf->draw(canvas, 0, 0, nullptr);
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new SrcModeGM;)