guard rasterizer and drawlooper setters

samplecode/SampleFilterFuzz.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 "SampleCode.h"
 #include "Sk1DPathEffect.h"
 #include "Sk2DPathEffect.h"
 #include "SkAlphaThresholdFilter.h"
@@ skipping 518 matching lines @@
                       SkTypeface::CreateFromName(make_font_name().c_str(), make_typeface_style()));
         paint.setTypeface(typeface);
     }
 
     SkLayerRasterizer::Builder rasterizerBuilder;
     SkPaint paintForRasterizer;
     if (R(2) == 1) {
         paintForRasterizer = make_paint();
     }
     rasterizerBuilder.addLayer(paintForRasterizer);
-    SkAutoTUnref<SkRasterizer> rasterizer(rasterizerBuilder.detachRasterizer());
-    paint.setRasterizer(rasterizer);
+    paint.setRasterizer(rasterizerBuilder.detach());
     paint.setImageFilter(make_image_filter());
     SkAutoDataUnref data(make_3Dlut(nullptr, make_bool(), make_bool(), make_bool()));
     paint.setTextAlign(make_paint_align());
     paint.setTextSize(make_scalar());
     paint.setTextScaleX(make_scalar());
     paint.setTextSkewX(make_scalar());
     paint.setTextEncoding(make_paint_text_encoding());
     return paint;
 }
 
@@ skipping 262 matching lines @@
     }
 
 private:
     typedef SkView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ImageFilterFuzzView; }
 static SkViewRegister reg(MyFactory);