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

src/gpu/GrContext.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 "GrContext.h"
 #include "GrContextPriv.h"
 #include "GrContextOptions.h"
@@ skipping 338 matching lines @@
             // conversion from a passed-in color space? For now, specifying nullptr means that this
             // path will do no conversion, so it will match the behavior of the non-draw path.
             sk_sp<GrDrawContext> drawContext(this->contextPriv().makeWrappedDrawContext(
                                                                         sk_ref_sp(renderTarget),
                                                                         nullptr));
             if (!drawContext) {
                 return false;
             }
             GrPaint paint;
             paint.addColorFragmentProcessor(std::move(fp));
-            paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+            paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
             paint.setAllowSRGBInputs(true);
             SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
             drawContext->drawRect(GrNoClip(), paint, matrix, rect, nullptr);
 
             if (kFlushWrites_PixelOp & pixelOpsFlags) {
                 this->flushSurfaceWrites(surface);
             }
         }
     }
     if (!tempTexture) {
@@ skipping 94 matching lines @@
                 }
             }
             if (!fp && tempDC) {
                 fp = GrConfigConversionEffect::Make(src->asTexture(), tempDrawInfo.fSwizzle,
                                                     GrConfigConversionEffect::kNone_PMConversion,
                                                     textureMatrix);
             }
             if (fp) {
                 GrPaint paint;
                 paint.addColorFragmentProcessor(std::move(fp));
-                paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+                paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
                 paint.setAllowSRGBInputs(true);
                 SkRect rect = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
                 tempDC->drawRect(GrNoClip(), paint, SkMatrix::I(), rect, nullptr);
                 surfaceToRead.reset(tempDC->asTexture().release());
                 left = 0;
                 top = 0;
                 didTempDraw = true;
             }
         }
     }
@@ skipping 349 matching lines @@
     ASSERT_SINGLE_OWNER
     fResourceCache->setLimits(maxTextures, maxTextureBytes);
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 void GrContext::dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const {
     ASSERT_SINGLE_OWNER
     fResourceCache->dumpMemoryStatistics(traceMemoryDump);
 }