guard rasterizer and drawlooper setters

include/effects/SkLayerDrawLooper.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLayerDrawLooper_DEFINED
 #define SkLayerDrawLooper_DEFINED
 
@@ skipping 124 matching lines @@
          */
         void addLayer() { this->addLayer(0, 0); }
 
         /// Similar to addLayer, but adds a layer to the top.
         SkPaint* addLayerOnTop(const LayerInfo&);
 
         /**
           * Pass list of layers on to newly built looper and return it. This will
           * also reset the builder, so it can be used to build another looper.
           */
-        SkLayerDrawLooper* detachLooper();
+        sk_sp<SkDrawLooper> detach();
+#ifdef SK_SUPPORT_LEGACY_MINOR_EFFECT_PTR
+        SkLayerDrawLooper* detachLooper() {
+            return (SkLayerDrawLooper*)this->detach().release();
+        }
+#endif
 
     private:
         Rec* fRecs;
         Rec* fTopRec;
         int  fCount;
     };
 };
 
 #endif