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

src/gpu/GrTextureParamsAdjuster.cpp

Index: src/gpu/GrTextureParamsAdjuster.cpp
diff --git a/src/gpu/GrTextureParamsAdjuster.cpp b/src/gpu/GrTextureParamsAdjuster.cpp
index 3ca90f5adb0a6e433743f9f2d9b406adb0021487..f51cc54aba77b7a2bc1cffe1c056cd882cf0ce21 100644
--- a/src/gpu/GrTextureParamsAdjuster.cpp
+++ b/src/gpu/GrTextureParamsAdjuster.cpp
@@ -72,7 +72,7 @@ static GrTexture* copy_on_gpu(GrTexture* inputTexture, const SkIRect* subset,
         GrTextureParams params(SkShader::kClamp_TileMode, copyParams.fFilter);
         paint.addColorTextureProcessor(inputTexture, nullptr, SkMatrix::I(), params);
     }
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
 
     SkRect localRect;
     if (subset) {