switch xfermodes over to sk_sp

gm/patch.cpp

 /*
  * Copyright 2014 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 "SkGradientShader.h"
 #include "SkPatchUtils.h"
@@ skipping 77 matching lines @@
         const SkXfermode::Mode modes[] = {
             SkXfermode::kSrc_Mode,
             SkXfermode::kDst_Mode,
             SkXfermode::kModulate_Mode,
         };
 
         sk_sp<SkShader> shader(make_shader());
 
         canvas->save();
         for (int y = 0; y < 3; y++) {
-            SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(modes[y]));
+            sk_sp<SkXfermode> xfer(SkXfermode::Make(modes[y]));
 
             for (int x = 0; x < 4; x++) {
                 canvas->save();
                 canvas->translate(x * 350.0f, y * 350.0f);
                 switch (x) {
                     case 0:
                         canvas->drawPatch(cubics, nullptr, nullptr, xfer, paint);
                         break;
                     case 1:
                         canvas->drawPatch(cubics, colors, nullptr, xfer, paint);
@@ skipping 11 matching lines @@
                     default:
                         break;
                 }
 
                 draw_control_points(canvas, cubics);
                 canvas->restore();
             }
         }
         canvas->restore();
 }