switch xfermodes over to sk_sp

tools/debugger/SkDrawCommand.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkDrawCommand.h"
 
@@ skipping 1151 matching lines @@
         if (colorFilter != nullptr) {
             target->setColorFilter(colorFilter);
         }
     }
 }
 
 static void extract_json_paint_xfermode(Json::Value& jsonPaint, UrlDataManager& urlDataManager,
                                         SkPaint* target) {
     if (jsonPaint.isMember(SKDEBUGCANVAS_ATTRIBUTE_XFERMODE)) {
         Json::Value jsonXfermode = jsonPaint[SKDEBUGCANVAS_ATTRIBUTE_XFERMODE];
-        SkXfermode* xfermode = (SkXfermode*) load_flattenable(jsonXfermode, urlDataManager);
+        sk_sp<SkXfermode> xfermode((SkXfermode*) load_flattenable(jsonXfermode, urlDataManager));
         if (xfermode != nullptr) {
             target->setXfermode(xfermode);
-            xfermode->unref();
         }
     }
 }
 
 static void extract_json_paint_looper(Json::Value& jsonPaint, UrlDataManager& urlDataManager,
                                       SkPaint* target) {
     if (jsonPaint.isMember(SKDEBUGCANVAS_ATTRIBUTE_LOOPER)) {
         Json::Value jsonLooper = jsonPaint[SKDEBUGCANVAS_ATTRIBUTE_LOOPER];
         sk_sp<SkDrawLooper> looper((SkDrawLooper*) load_flattenable(jsonLooper, urlDataManager));
         if (looper != nullptr) {
@@ skipping 1942 matching lines @@
     result[SKDEBUGCANVAS_ATTRIBUTE_MATRIX] = MakeJsonMatrix(fMatrix);
     return result;
 }
 
 SkSetMatrixCommand* SkSetMatrixCommand::fromJSON(Json::Value& command,
                                                  UrlDataManager& urlDataManager) {
     SkMatrix matrix;
     extract_json_matrix(command[SKDEBUGCANVAS_ATTRIBUTE_MATRIX], &matrix);
     return new SkSetMatrixCommand(matrix);
 }