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

src/core/SkPaintPriv.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 "SkBitmap.h"
 #include "SkColorFilter.h"
 #include "SkPaintPriv.h"
@@ skipping 23 matching lines @@
             opacityType = SkXfermode::kOpaque_SrcColorOpacity;
         } else if (0 == paintAlpha) {
             if (overrideOpacity == kNone_ShaderOverrideOpacity && !paint->getShader()) {
                 opacityType = SkXfermode::kTransparentBlack_SrcColorOpacity;
             } else {
                 opacityType = SkXfermode::kTransparentAlpha_SrcColorOpacity;
             }
         }
     }
 
-    return SkXfermode::IsOpaque(paint->getXfermode(), opacityType);
+    return SkXfermode::IsOpaque(paint->getBlendMode(), opacityType);
 }
 
 bool SkPaintPriv::Overwrites(const SkBitmap& bitmap, const SkPaint* paint) {
     return Overwrites(paint, bitmap.isOpaque() ? kOpaque_ShaderOverrideOpacity
                                                : kNotOpaque_ShaderOverrideOpacity);
 }
 
 bool SkPaintPriv::Overwrites(const SkImage* image, const SkPaint* paint) {
     return Overwrites(paint, image->isOpaque() ? kOpaque_ShaderOverrideOpacity
                                                : kNotOpaque_ShaderOverrideOpacity);
 }