change flattenable factory to return sk_sp

src/effects/SkBlurMaskFilter.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlurMaskFilter.h"
 #include "SkBlurMask.h"
 #include "SkGpuBlurUtils.h"
@@ skipping 563 matching lines @@
 }
 
 void SkBlurMaskFilterImpl::computeFastBounds(const SkRect& src,
                                              SkRect* dst) const {
     SkScalar pad = 3.0f * fSigma;
 
     dst->set(src.fLeft  - pad, src.fTop    - pad,
              src.fRight + pad, src.fBottom + pad);
 }
 
-SkFlattenable* SkBlurMaskFilterImpl::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkBlurMaskFilterImpl::CreateProc(SkReadBuffer& buffer) {
     const SkScalar sigma = buffer.readScalar();
     const unsigned style = buffer.readUInt();
     const unsigned flags = buffer.readUInt();
     if (style <= kLastEnum_SkBlurStyle) {
-        return SkBlurMaskFilter::Create((SkBlurStyle)style, sigma, flags);
+        return sk_sp<SkFlattenable>(SkBlurMaskFilter::Create((SkBlurStyle)style, sigma, flags));
     }
     return nullptr;
 }
 
 void SkBlurMaskFilterImpl::flatten(SkWriteBuffer& buffer) const {
     buffer.writeScalar(fSigma);
     buffer.writeUInt(fBlurStyle);
     buffer.writeUInt(fBlurFlags);
 }
 
@@ skipping 708 matching lines @@
     } else {
         str->append("None");
     }
     str->append("))");
 }
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END