guard rasterizer and drawlooper setters

include/effects/SkLayerDrawLooper.h

Index: include/effects/SkLayerDrawLooper.h
diff --git a/include/effects/SkLayerDrawLooper.h b/include/effects/SkLayerDrawLooper.h
index 76172dfd4b1dfcfb45296bac51a36dcff101d344..6ddde888ebeb2b3deaffc6dc534f5e6ebdc7f235 100644
--- a/include/effects/SkLayerDrawLooper.h
+++ b/include/effects/SkLayerDrawLooper.h
@@ -142,7 +142,12 @@ public:
           * 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;