change flattenable factory to return sk_sp

src/image/SkImageShader.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProvider.h"
 #include "SkImage_Base.h"
 #include "SkImageShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 
 SkImageShader::SkImageShader(const SkImage* img, TileMode tmx, TileMode tmy, const SkMatrix* matrix)
     : INHERITED(matrix)
     , fImage(SkRef(img))
     , fTileModeX(tmx)
     , fTileModeY(tmy)
 {}
 
-SkFlattenable* SkImageShader::CreateProc(SkReadBuffer& buffer) {
+sk_sp<SkFlattenable> SkImageShader::CreateProc(SkReadBuffer& buffer) {
     const TileMode tx = (TileMode)buffer.readUInt();
     const TileMode ty = (TileMode)buffer.readUInt();
     SkMatrix matrix;
     buffer.readMatrix(&matrix);
     SkAutoTUnref<SkImage> img(buffer.readImage());
     if (!img) {
         return nullptr;
     }
-    return SkImageShader::Make(img, tx, ty, &matrix).release();
+    return SkImageShader::Make(img, tx, ty, &matrix);
 }
 
 void SkImageShader::flatten(SkWriteBuffer& buffer) const {
     buffer.writeUInt(fTileModeX);
     buffer.writeUInt(fTileModeY);
     buffer.writeMatrix(this->getLocalMatrix());
     buffer.writeImage(fImage);
 }
 
 bool SkImageShader::isOpaque() const {
@@ skipping 83 matching lines @@
         inner.reset(GrSimpleTextureEffect::Create(texture, matrix, params));
     }
 
     if (GrPixelConfigIsAlphaOnly(texture->config())) {
         return SkRef(inner.get());
     }
     return GrFragmentProcessor::MulOutputByInputAlpha(inner);
 }
 
 #endif