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

Source/core/rendering/svg/SVGInlineTextBox.cpp

Index: Source/core/rendering/svg/SVGInlineTextBox.cpp
diff --git a/Source/core/rendering/svg/SVGInlineTextBox.cpp b/Source/core/rendering/svg/SVGInlineTextBox.cpp
index 0a08afbed09a9e873c616604df0f4f3a0d79d424..ac889382b1b6de1e1ee835be831050ae103a66b6 100644
--- a/Source/core/rendering/svg/SVGInlineTextBox.cpp
+++ b/Source/core/rendering/svg/SVGInlineTextBox.cpp
@@ -638,14 +638,14 @@ void SVGInlineTextBox::paintTextWithShadows(GraphicsContext* context, RenderStyl
     }
 
     if (hasShadow) {
-        DrawLooper drawLooper;
+        RefPtr<DrawLooper> drawLooper = adoptRef(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)) {