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

src/gpu/GrTextureToYUVPlanes.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextureToYUVPlanes.h"
 #include "effects/GrSimpleTextureEffect.h"
 #include "effects/GrYUVEffect.h"
@@ skipping 23 matching lines @@
     sk_sp<GrFragmentProcessor> fp(
             GrSimpleTextureEffect::Make(src, nullptr, SkMatrix::MakeScale(xScale, yScale), filter));
     if (!fp) {
         return false;
     }
     fp = proc(std::move(fp), colorSpace);
     if (!fp) {
         return false;
     }
     GrPaint paint;
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     paint.addColorFragmentProcessor(std::move(fp));
     dst->drawRect(GrNoClip(), paint, SkMatrix::I(), SkRect::MakeIWH(dstW, dstH));
     return true;
 }
 
 bool GrTextureToYUVPlanes(GrTexture* texture, const SkISize sizes[3], void* const planes[3],
                           const size_t rowBytes[3], SkYUVColorSpace colorSpace) {
     if (GrContext* context = texture->getContext()) {
         // Depending on the relative sizes of the y, u, and v planes we may do 1 to 3 draws/
         // readbacks.
@@ skipping 169 matching lines @@
                 if (!tex->readPixels(0, 0, sizes[2].fWidth, sizes[2].fHeight,
                                      kAlpha_8_GrPixelConfig, planes[2], rowBytes[2])) {
                     return false;
                 }
                 return true;
             }
         }
     }
     return false;
 }