switch xfermodes over to sk_sp

gm/vertices.cpp

 /*
  * Copyright 2013 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 "SkColorFilter.h"
@@ skipping 136 matching lines @@
             SkXfermode::kSaturation_Mode,
             SkXfermode::kColor_Mode,
             SkXfermode::kLuminosity_Mode,
         };
 
         SkPaint paint;
 
         canvas->translate(4, 4);
         int x = 0;
         for (size_t j = 0; j < SK_ARRAY_COUNT(modes); ++j) {
-            SkXfermode* xfer = SkXfermode::Create(modes[j]);
+            auto xfer = SkXfermode::Make(modes[j]);
             canvas->save();
             for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
                 paint.setShader(rec[i].fShader);
                 paint.setColorFilter(rec[i].fColorFilter);
                 paint.setAlpha(rec[i].fAlpha);
                 //if (2 == x)
                 canvas->drawVertices(SkCanvas::kTriangleFan_VertexMode,
                                      SK_ARRAY_COUNT(fPts), fPts,
                                      rec[i].fTexs, rec[i].fColors,
                                      xfer, fan, SK_ARRAY_COUNT(fan), paint);
                 canvas->translate(40, 0);
                 ++x;
             }
             canvas->restore();
             canvas->translate(0, 40);
-            SkSafeUnref(xfer);
         }
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new VerticesGM();)