Add gpu implementation of OverdrawXfermode

debugger/QT/SkDebuggerGUI.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 "SkDebuggerGUI.h"
 #include "SkPicture.h"
 #include <QListWidgetItem>
@@ skipping 184 matching lines @@
             fListWidget.setCurrentItem(item);
             return;
         }
     }
     fListWidget.setCurrentRow(fListWidget.count() - 1);
 }
 
 void SkDebuggerGUI::actionRasterSettingsChanged() {
     fCanvasWidget.setWidgetVisibility(SkCanvasWidget::kRaster_8888_WidgetType,
                                       !fSettingsWidget.isRasterEnabled());
-    fDebugger.setOverdrawViz(fSettingsWidget.isOverdrawVizEnabled());
     this->updateImage();
 }
 
 void SkDebuggerGUI::actionVisualizationsChanged() {
     fDebugger.setMegaViz(fSettingsWidget.isMegaVizEnabled());
     fDebugger.setPathOps(fSettingsWidget.isPathOpsEnabled());
     fDebugger.highlightCurrentCommand(fSettingsWidget.isVisibilityFilterEnabled());
+    fDebugger.setOverdrawViz(fSettingsWidget.isOverdrawVizEnabled());
     this->updateImage();
 }
 
 void SkDebuggerGUI::actionTextureFilter() {
     SkFilterQuality quality;
     bool enabled = fSettingsWidget.getFilterOverride(&quality);
     fDebugger.setTexFilterOverride(enabled, quality);
     fCanvasWidget.update();
 }
 
@@ skipping 572 matching lines @@
         fCanvasWidget.drawTo(fPausedRow);
     } else {
         fCanvasWidget.drawTo(fListWidget.currentRow());
     }
 }
 
 void SkDebuggerGUI::updateHit(int newHit) {
     fCommandHitBox.setText(QString::number(newHit));
 }