switch surface to sk_sp

gm/bigtileimagefilter.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 "SkImageSource.h"
 #include "SkSurface.h"
 #include "SkTileImageFilter.h"
 #include "gm.h"
 
 static sk_sp<SkImage> create_circle_texture(int size, SkColor color) {
-    SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(size, size));
+    auto surface(SkSurface::MakeRasterN32Premul(size, size));
     SkCanvas* canvas = surface->getCanvas();
     canvas->clear(0xFF000000);
 
     SkPaint paint;
     paint.setColor(color);
     paint.setStrokeWidth(3);
     paint.setStyle(SkPaint::kStroke_Style);
 
     canvas->drawCircle(SkScalarHalf(size), SkScalarHalf(size), SkScalarHalf(size), paint);
 
@@ skipping 73 matching lines @@
     sk_sp<SkImage> fRedImage;
     sk_sp<SkImage> fGreenImage;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new BigTileImageFilterGM;)
 }