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

gm/picture.cpp

 /*
  * Copyright 2014 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 "SkPaint.h"
 #include "SkPictureRecorder.h"
@@ skipping 11 matching lines @@
 
     paint.setColor(0x80FF0000);
     path.moveTo(0, 0); path.lineTo(100, 0); path.lineTo(100, 100);
     canvas->drawPath(path, paint);
 
     paint.setColor(0x8000FF00);
     path.reset(); path.moveTo(0, 0); path.lineTo(100, 0); path.lineTo(0, 100);
     canvas->drawPath(path, paint);
 
     paint.setColor(0x80FFFFFF);
-    paint.setXfermodeMode(SkXfermode::kPlus_Mode);
+    paint.setBlendMode(SkBlendMode::kPlus);
     canvas->drawRect(SkRect::MakeXYWH(25, 25, 50, 50), paint);
 
     return rec.finishRecordingAsPicture();
 }
 
 // Exercise the optional arguments to drawPicture
 //
 class PictureGM : public skiagm::GM {
 public:
     PictureGM()
@@ skipping 32 matching lines @@
         canvas->drawPicture(fPicture, &matrix, &paint);
     }
 
 private:
     sk_sp<SkPicture> fPicture;
 
     typedef skiagm::GM INHERITED;
 };
 
 DEF_GM(return new PictureGM;)