Create SkLayerRasterizer w/o destroying Builder.

include/effects/SkLayerRasterizer.h

Index: include/effects/SkLayerRasterizer.h
diff --git a/include/effects/SkLayerRasterizer.h b/include/effects/SkLayerRasterizer.h
index fdfb179cb6bab604188c2f20b12f74697e29b757..4a0cd2e94f42e4988538b00012772f9b24f59b3e 100644
--- a/include/effects/SkLayerRasterizer.h
+++ b/include/effects/SkLayerRasterizer.h
@@ -39,10 +39,16 @@ public:
 
         /**
           *  Pass queue of layers on to newly created layer rasterizer and return it. The builder
-          *  cannot be used any more after calling this function.
+          *  *cannot* be used any more after calling this function.
           */
         SkLayerRasterizer* detachRasterizer();
 
+        /**
+          *  Copy queue of layers to a newly created layer rasterizer and return it. The builder
+          *  *may* be used after calling this function.

[reed1, 2014/04/10 19:53:04]

Builder b;
b.addLayer(A)
x = b.copyRasterizer
b.addLayer(B)
y = b.copyRasterizer // or b.detachRasterizer

What is in x?
What is in y?

[scroggo, 2014/04/10 20:14:24]

Latest patch clarifies things.

+          */
+        SkLayerRasterizer* copyRasterizer();
+
     private:
         SkDeque* fLayers;
     };
@@ -86,6 +92,8 @@ private:
 
     static SkDeque* ReadLayers(SkReadBuffer& buffer);
 
+    friend class LayerRasterizerTester;
+
     typedef SkRasterizer INHERITED;
 };