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

Source/core/rendering/svg/SVGInlineTextBox.cpp

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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 607 matching lines @@
     FloatSize textSize(fragment.width, fragment.height);
 
     if (scalingFactor != 1) {
         textOrigin.scale(scalingFactor, scalingFactor);
         textSize.scale(scalingFactor);
         context->save();
         context->scale(FloatSize(1 / scalingFactor, 1 / scalingFactor));
     }
 
     if (hasShadow) {
-        DrawLooper drawLooper;
+        RefPtr<DrawLooper> drawLooper(new DrawLooper);
         do {
             FloatSize offset(shadow->x(), shadow->y());
-            drawLooper.addShadow(offset, shadow->blur(), textRenderer->resolveColor(shadow->color(), Color::stdShadowColor),
+            drawLooper->addShadow(offset, shadow->blur(), textRenderer->resolveColor(shadow->color(), Color::stdShadowColor),
                 DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowRespectsAlpha);
         } while ((shadow = shadow->next()));
-        drawLooper.addUnmodifiedContent();
-        context->setDrawLooper(drawLooper);
+        drawLooper->addUnmodifiedContent();
+        context->setDrawLooper(drawLooper.release());
     }
 
     if (prepareGraphicsContextForTextPainting(context, scalingFactor, textRun, style)) {
         TextRunPaintInfo textRunPaintInfo(textRun);
         textRunPaintInfo.from = startPosition;
         textRunPaintInfo.to = endPosition;
         textRunPaintInfo.bounds = FloatRect(textOrigin, textSize);
         scaledFont.drawText(context, textRunPaintInfo, textOrigin);
         restoreGraphicsContextAfterTextPainting(context, textRun);
     }
@@ skipping 86 matching lines @@
                 renderer()->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
                 if (!result.addNodeToRectBasedTestResult(renderer()->node(), request, locationInContainer, rect))
                     return true;
              }
         }
     }
     return false;
 }
 
 } // namespace WebCore