Make sure SkDrawLooper objects can only be allocated on the heap.

bench/RectoriBench.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 "SkBenchmark.h"
 #include "SkCanvas.h"
 #include "SkPaint.h"
@@ skipping 53 matching lines @@
         }
     }
 
 private:
     enum {
         W = 640,
         H = 480,
     };
 
     SkLayerDrawLooper* createLooper(SkScalar xOff, SkScalar sigma) {
-        SkLayerDrawLooper* looper = new SkLayerDrawLooper;
+        SkLayerDrawLooper::Builder looperBuilder;
 
         //-----------------------------------------------
         SkLayerDrawLooper::LayerInfo info;
 
         // TODO: add a color filter to better match what is seen in the wild
         info.fPaintBits = /* SkLayerDrawLooper::kColorFilter_Bit |*/
                           SkLayerDrawLooper::kMaskFilter_Bit;
         info.fColorMode = SkXfermode::kDst_Mode;
         info.fOffset.set(xOff, 0);
         info.fPostTranslate = false;
 
-        SkPaint* paint = looper->addLayer(info);
+        SkPaint* paint = looperBuilder.addLayer(info);
 
         SkMaskFilter* mf = SkBlurMaskFilter::Create(SkBlurMaskFilter::kNormal_BlurStyle,
                                                     sigma,
                                                     SkBlurMaskFilter::kHighQuality_BlurFlag);
         paint->setMaskFilter(mf)->unref();
 
         //-----------------------------------------------
         info.fPaintBits = 0;
         info.fOffset.set(0, 0);
 
-        paint = looper->addLayer(info);
-        return looper;
+        paint = looperBuilder.addLayer(info);
+        return looperBuilder.detachLooper();
     }
 
     typedef SkBenchmark INHERITED;
 };
 
 DEF_BENCH( return SkNEW_ARGS(RectoriBench, ()); )