change flattenable factory to return sk_sp

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 62 matching lines @@
 
     SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const override;
 
     size_t contextSize() const override { return sizeof(LayerDrawLooperContext); }
 
     bool asABlurShadow(BlurShadowRec* rec) const override;
 
     SK_TO_STRING_OVERRIDE()
 
     Factory getFactory() const override { return CreateProc; }
-    static SkFlattenable* CreateProc(SkReadBuffer& buffer);
+    static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer);
 
 protected:
     SkLayerDrawLooper();
 
     void flatten(SkWriteBuffer&) const override;
 
 private:
     struct Rec {
         Rec*    fNext;
         SkPaint fPaint;
@@ skipping 56 matching lines @@
 #endif
 
     private:
         Rec* fRecs;
         Rec* fTopRec;
         int  fCount;
     };
 };
 
 #endif