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

gm/blurroundrect.cpp

Index: gm/blurroundrect.cpp
diff --git a/gm/blurroundrect.cpp b/gm/blurroundrect.cpp
index 6c3903fd4070f03c2ae7fdbc4c89363bdc392e2e..f688380f0e0253e6b96d6ca406c5fcd150d89c6d 100644
--- a/gm/blurroundrect.cpp
+++ b/gm/blurroundrect.cpp
@@ -53,7 +53,7 @@ public:
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
-        SkLayerDrawLooper* looper = new SkLayerDrawLooper;
+        SkLayerDrawLooper::Builder looperBuilder;
         {
             SkLayerDrawLooper::LayerInfo info;
             info.fPaintBits = SkLayerDrawLooper::kMaskFilter_Bit
@@ -61,7 +61,7 @@ public:
             info.fColorMode = SkXfermode::kSrc_Mode;
             info.fOffset = SkPoint::Make(SkIntToScalar(-1), SkIntToScalar(0));
             info.fPostTranslate = false;
-            SkPaint* paint = looper->addLayerOnTop(info);
+            SkPaint* paint = looperBuilder.addLayerOnTop(info);
             SkMaskFilter* maskFilter = SkBlurMaskFilter::Create(
                     SkBlurMaskFilter::kNormal_BlurStyle,
                     SkBlurMask::ConvertRadiusToSigma(SK_ScalarHalf),
@@ -74,12 +74,12 @@ public:
         }
         {
             SkLayerDrawLooper::LayerInfo info;
-            looper->addLayerOnTop(info);
+            looperBuilder.addLayerOnTop(info);
         }
         SkPaint paint;
         canvas->drawRect(fRRect.rect(), paint);
 
-        paint.setLooper(looper)->unref();
+        paint.setLooper(looperBuilder.detachLooper())->unref();
         paint.setColor(SK_ColorCYAN);
         paint.setAntiAlias(true);