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

gm/gm.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 "SkShader.h"
 using namespace skiagm;
@@ skipping 40 matching lines @@
     fBGColor = color;
 }
 
 bool GM::animate(const SkAnimTimer& timer) {
     return this->onAnimate(timer);
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////////
 
 void GM::onDrawBackground(SkCanvas* canvas) {
-    canvas->drawColor(fBGColor, SkXfermode::kSrc_Mode);
+    canvas->drawColor(fBGColor, SkBlendMode::kSrc);
 }
 
 void GM::drawSizeBounds(SkCanvas* canvas, SkColor color) {
     SkISize size = this->getISize();
     SkRect r = SkRect::MakeWH(SkIntToScalar(size.width()),
                               SkIntToScalar(size.height()));
     SkPaint paint;
     paint.setColor(color);
     canvas->drawRect(r, paint);
 }
@@ skipping 28 matching lines @@
     fDrawProc(canvas);
 }
 
 SkISize skiagm::SimpleGM::onISize() {
     return fSize;
 }
 
 SkString skiagm::SimpleGM::onShortName() {
     return fName;
 }