switch xfermodes over to sk_sp

src/core/SkShader.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 "SkAtomics.h"
 #include "SkBitmapProcShader.h"
 #include "SkColorShader.h"
@@ skipping 435 matching lines @@
 }
 SkShader* SkShader::CreatePictureShader(const SkPicture* src, TileMode tmx, TileMode tmy,
                                      const SkMatrix* localMatrix, const SkRect* tile) {
     return MakePictureShader(sk_ref_sp(const_cast<SkPicture*>(src)), tmx, tmy,
                              localMatrix, tile).release();
 }
 SkShader* SkShader::newWithColorFilter(SkColorFilter* filter) const {
     return this->makeWithColorFilter(sk_ref_sp(filter)).release();
 }
 #endif
+
+#ifdef SK_SUPPORT_LEGACY_XFERMODE_PTR
+#include "SkXfermode.h"
+sk_sp<SkShader> SkShader::MakeComposeShader(sk_sp<SkShader> dst, sk_sp<SkShader> src,
+                                            SkXfermode* xfer) {
+    return MakeComposeShader(std::move(dst), std::move(src), sk_ref_sp(xfer));
+}
+#endif