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

gm/bitmaprect.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
@@ skipping 183 matching lines @@
         return SkISize::Make(640, 480);
     }
 
     void onOnceBeforeDraw() override {
         make_big_bitmap(&fBigBitmap);
     }
 
     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAlpha(128);
-        paint.setXfermode(SkXfermode::Make(SkXfermode::kXor_Mode));
+        paint.setBlendMode(SkBlendMode::kXor);
 
         SkRect srcR1 = { 0.0f, 0.0f, 4096.0f, 2040.0f };
         SkRect dstR1 = { 10.1f, 10.1f, 629.9f, 400.9f };
 
         SkRect srcR2 = { 4085.0f, 10.0f, 4087.0f, 12.0f };
         SkRect dstR2 = { 10, 410, 30, 430 };
 
         if (!fUseIRect) {
             canvas->drawBitmapRect(fBigBitmap, srcR1, dstR1, &paint,
                                    SkCanvas::kStrict_SrcRectConstraint);
@@ skipping 56 matching lines @@
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new DrawBitmapRect2(false); )
 DEF_GM( return new DrawBitmapRect2(true); )
 DEF_GM( return new DrawBitmapRect3(); )
 
 #ifndef SK_BUILD_FOR_ANDROID
 DEF_GM( return new DrawBitmapRect4(false); )
 DEF_GM( return new DrawBitmapRect4(true); )
 #endif