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

src/effects/SkColorFilterImageFilter.cpp

 /*
  * Copyright 2012 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 "SkColorFilterImageFilter.h"
 
 #include "SkCanvas.h"
@@ skipping 71 matching lines @@
     sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
     if (!surf) {
         return nullptr;
     }
 
     SkCanvas* canvas = surf->getCanvas();
     SkASSERT(canvas);
 
     SkPaint paint;
 
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    paint.setBlendMode(SkBlendMode::kSrc);
     paint.setColorFilter(fColorFilter);
 
     // TODO: it may not be necessary to clear or drawPaint inside the input bounds
     // (see skbug.com/5075)
     if (fColorFilter->affectsTransparentBlack()) {
         // The subsequent input->draw() call may not fill the entire canvas. For filters which
         // affect transparent black, ensure that the filter is applied everywhere.
         paint.setColor(SK_ColorTRANSPARENT);
         canvas->drawPaint(paint);
         paint.setColor(SK_ColorBLACK);
@@ skipping 37 matching lines @@
     if (this->getInput(0)) {
         this->getInput(0)->toString(str);
     }
 
     str->appendf(") color filter: ");
     fColorFilter->toString(str);
 
     str->append(")");
 }
 #endif