switch xfermodes over to sk_sp

samplecode/PerlinPatch.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkAnimTimer.h"
 #include "SkCanvas.h"
@@ skipping 120 matching lines @@
         SkPaint paint;
 
         SkScalar texWidth = fTexScale * TexWidth;
         SkScalar texHeight = fTexScale * TexHeight;
         const SkPoint texCoords[SkPatchUtils::kNumCorners] = {
             { fTexX - texWidth, fTexY - texHeight},
             { fTexX + texWidth, fTexY - texHeight},
             { fTexX + texWidth, fTexY + texHeight},
             { fTexX - texWidth, fTexY + texHeight}}
         ;
-
-        SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(SkXfermode::kSrc_Mode));
+        
+        sk_sp<SkXfermode> xfer(SkXfermode::Make(SkXfermode::kSrc_Mode));
 
         SkScalar scaleFreq = 2.0;
         fShader1 = SkPerlinNoiseShader2::MakeImprovedNoise(fXFreq/scaleFreq, fYFreq/scaleFreq, 4,
                                                              fSeed);
         fShaderCompose = SkShader::MakeComposeShader(fShader0, fShader1, nullptr);
 
         paint.setShader(fShaderCompose);
         canvas->drawPatch(fPts, nullptr, texCoords, xfer, paint);
 
         draw_control_points(canvas, fPts);
@@ skipping 44 matching lines @@
         }
         this->inval(nullptr);
         return true;
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 DEF_SAMPLE( return new PerlinPatchView(); )