switch surface to sk_sp

gm/perspshaders.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 "gm.h"
 #include "SkGradientShader.h"
 #include "SkImage.h"
 #include "SkPath.h"
 #include "SkSurface.h"
 
 static sk_sp<SkImage> make_image(SkCanvas* origCanvas, int w, int h) {
     SkImageInfo info = SkImageInfo::MakeN32Premul(w, h);
-    SkAutoTUnref<SkSurface> surface(origCanvas->newSurface(info));
+    auto surface(origCanvas->makeSurface(info));
     if (nullptr == surface) {
-        surface.reset(SkSurface::NewRaster(info));
+        surface = SkSurface::MakeRaster(info);
     }
     SkCanvas* canvas = surface->getCanvas();
 
     sk_tool_utils::draw_checkerboard(canvas, SK_ColorRED, SK_ColorGREEN, w/10);
     return surface->makeImageSnapshot();
 }
 
 namespace skiagm {
 
 class PerspShadersGM : public GM {
@@ skipping 136 matching lines @@
     SkBitmap        fBitmap;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new PerspShadersGM(true);)
 DEF_GM(return new PerspShadersGM(false);)
 }