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

gm/aaclip.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkPath.h"
 
 static void do_draw(SkCanvas* canvas, const SkRect& r) {
     SkPaint paint;
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    paint.setBlendMode(SkBlendMode::kSrc);
     paint.setColor(0x800000FF);
     canvas->drawRect(r, paint);
 }
 
 /**
  *  Exercise kDontClipToLayer_Legacy_SaveLayerFlag flag, which does not limit the clip to the
  *  layer's bounds. Thus when a draw occurs, it can (depending on "where" it is) draw into the layer
  *  and/or draw onto the surrounding portions of the canvas, or both.
  *
  *  This GM has a 100x100 rectangle (r), which its going to draw. However first it creates a layer
@@ skipping 284 matching lines @@
         canvas->translate(80, 10);
         this->drawAndClip(canvas, fVPath, 200, 0);
         canvas->translate(0, 200);
         this->drawAndClip(canvas, fHPath, 200, 0);
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM(return new ClipCubicGM;)