Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

bench/RectBench.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "Benchmark.h"
 #include "SkCanvas.h"
 #include "SkCommandLineFlags.h"
 #include "SkPaint.h"
@@ skipping 67 matching lines @@
             this->drawThisRect(canvas, fRects[i % N], paint);
         }
     }
 private:
     typedef Benchmark INHERITED;
 };
 
 class SrcModeRectBench : public RectBench {
 public:
     SrcModeRectBench() : INHERITED(1, 0) {
-        fMode = SkXfermode::Make(SkXfermode::kSrc_Mode);
+        fMode = SkBlendMode::kSrc;
     }
 
 protected:
     void setupPaint(SkPaint* paint) override {
         this->INHERITED::setupPaint(paint);
         // srcmode is most interesting when we're not opaque
         paint->setAlpha(0x80);
-        paint->setXfermode(fMode);
+        paint->setBlendMode(fMode);
     }
 
     const char* onGetName() override {
         fName.set(this->INHERITED::onGetName());
         fName.prepend("srcmode_");
         return fName.c_str();
     }
 
 private:
-    SkString fName;
-    sk_sp<SkXfermode> fMode;
+    SkString    fName;
+    SkBlendMode fMode;
 
     typedef RectBench INHERITED;
 };
 
 class TransparentRectBench : public RectBench {
 public:
     TransparentRectBench() : INHERITED(1, 0) {}
 
 protected:
     void setupPaint(SkPaint* paint) override {
@@ skipping 177 matching lines @@
                                    "maskopaque");)
 DEF_BENCH(return new BlitMaskBench(SkCanvas::kPoints_PointMode,
                                    BlitMaskBench::kMaskBlack,
                                    "maskblack");)
 DEF_BENCH(return new BlitMaskBench(SkCanvas::kPoints_PointMode,
                                    BlitMaskBench::kMaskColor,
                                    "maskcolor");)
 DEF_BENCH(return new BlitMaskBench(SkCanvas::kPoints_PointMode,
                                    BlitMaskBench::KMaskShader,
                                    "maskshader");)