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

tools/debugger/SkDebugCanvas.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvasPriv.h"
 #include "SkClipStack.h"
 #include "SkDebugCanvas.h"
@@ skipping 24 matching lines @@
         : INHERITED(width, height)
         , fOverdrawXfermode(overdrawViz ? SkOverdrawMode::Make() : nullptr)
         , fOverrideFilterQuality(overrideFilterQuality)
         , fFilterQuality(quality) {}
 
 protected:
     bool onFilter(SkTCopyOnFirstWrite<SkPaint>* paint, Type) const override {
         if (*paint) {
             if (nullptr != fOverdrawXfermode.get()) {
                 paint->writable()->setAntiAlias(false);
-                paint->writable()->setXfermode(fOverdrawXfermode);
+                // TODO: replace overdraw mode with something else
+//                paint->writable()->setXfermode(fOverdrawXfermode);
             }
 
             if (fOverrideFilterQuality) {
                 paint->writable()->setFilterQuality(fFilterQuality);
             }
         }
         return true;
     }
 
     void onDrawPicture(const SkPicture* picture,
@@ skipping 791 matching lines @@
 }
 
 bool SkDebugCanvas::lastClipStackData(const SkPath& devPath) {
     if (fCalledAddStackData) {
         fClipStackData.appendf("<br>");
         addPathData(devPath, "pathOut");
         return true;
     }
     return false;
 }