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

src/effects/SkDropShadowImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDropShadowImageFilter.h"
 
 #include "SkBlurImageFilter.h"
@@ skipping 77 matching lines @@
     canvas->clear(0x0);
 
     SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
     ctx.ctm().mapVectors(&sigma, 1);
     sigma.fX = SkMaxScalar(0, sigma.fX);
     sigma.fY = SkMaxScalar(0, sigma.fY);
 
     SkPaint paint;
     paint.setImageFilter(SkBlurImageFilter::Make(sigma.fX, sigma.fY, nullptr));
     paint.setColorFilter(SkColorFilter::MakeModeFilter(fColor, SkXfermode::kSrcIn_Mode));
-    paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
 
     SkVector offsetVec = SkVector::Make(fDx, fDy);
     ctx.ctm().mapVectors(&offsetVec, 1);
 
     canvas->translate(SkIntToScalar(inputOffset.fX - bounds.fLeft),
                       SkIntToScalar(inputOffset.fY - bounds.fTop));
     input->draw(canvas, offsetVec.fX, offsetVec.fY, &paint);
 
     if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
         input->draw(canvas, 0, 0, nullptr);
@@ skipping 53 matching lines @@
         "kDrawShadowAndForeground", "kDrawShadowOnly"
     };
 
     static_assert(kShadowModeCount == SK_ARRAY_COUNT(gModeStrings), "enum_mismatch");
 
     str->appendf(" mode: %s", gModeStrings[fShadowMode]);
 
     str->append(")");
 }
 #endif