Refactoring DrawLooper so that it can apply shadow effects as skia image filters

Source/core/rendering/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 378 matching lines @@
     const AtomicString& emphasisMark, int emphasisMarkOffset,
     int startOffset, int endOffset, int truncationPoint,
     const FloatPoint& textOrigin, const FloatRect& boxRect,
     const ShadowData* shadow, bool stroked, bool horizontal)
 {
     // Text shadows are disabled when printing. http://crbug.com/258321
     bool hasShadow = shadow && !context->printing();
     Color fillColor = context->fillColor();
 
     if (hasShadow) {
-        DrawLooper drawLooper;
+        RefPtr<DrawLooper> drawLooper = adoptRef(new DrawLooper);
         do {
             int shadowX = horizontal ? shadow->x() : shadow->y();
             int shadowY = horizontal ? shadow->y() : -shadow->x();
             FloatSize offset(shadowX, shadowY);
-            drawLooper.addShadow(offset, shadow->blur(),
+            drawLooper->addShadow(offset, shadow->blur(),
                 renderer->resolveColor(shadow->color(), Color::stdShadowColor),
                 DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
         } while ((shadow = shadow->next()));
-        drawLooper.addUnmodifiedContent();
-        context->setDrawLooper(drawLooper);
+        drawLooper->addUnmodifiedContent();
+        context->setDrawLooper(drawLooper.release());
     }
 
     TextRunPaintInfo textRunPaintInfo(textRun);
     textRunPaintInfo.bounds = boxRect;
     if (startOffset <= endOffset) {
         textRunPaintInfo.from = startOffset;
         textRunPaintInfo.to = endOffset;
         if (emphasisMark.isEmpty())
             context->drawText(font, textRunPaintInfo, textOrigin);
         else
@@ skipping 1139 matching lines @@
     printedCharacters = fprintf(stderr, "\t%s %p", obj->renderName(), obj);
     const int rendererCharacterOffset = 24;
     for (; printedCharacters < rendererCharacterOffset; printedCharacters++)
         fputc(' ', stderr);
     fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
 }
 
 #endif
 
 } // namespace WebCore