Use SkLayerDrawLooper::Builder to construct SkLayerDrawLooper.

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 319 matching lines @@
     DrawLooper::ShadowAlphaMode shadowAlphaMode)
 {
     if (paintingDisabled())
         return;
 
     if (!color.alpha() || (!offset.width() && !offset.height() && !blur)) {
         clearShadow();
         return;
     }
 
-    DrawLooper drawLooper;
-    drawLooper.addShadow(offset, blur, color, shadowTransformMode, shadowAlphaMode);
-    drawLooper.addUnmodifiedContent();
-    setDrawLooper(drawLooper);
+    DrawLooper::Builder drawLooperBuilder;
+    drawLooperBuilder.addShadow(offset, blur, color, shadowTransformMode, shadowAlphaMode);
+    drawLooperBuilder.addUnmodifiedContent();
+    setDrawLooper(*drawLooperBuilder.detachDrawLooper());
 }
 
 void GraphicsContext::setDrawLooper(const DrawLooper& drawLooper)
 {
     if (paintingDisabled())
         return;
 
     mutableState()->m_looper = drawLooper.skDrawLooper();
 }
 
@@ skipping 411 matching lines @@
     save();
     if (rect.isRounded()) {
         Path path;
         path.addRoundedRect(rect);
         clipPath(path);
         roundedHole.shrinkRadii(shadowSpread);
     } else {
         clip(rect.rect());
     }
 
-    DrawLooper drawLooper;
-    drawLooper.addShadow(shadowOffset, shadowBlur, shadowColor,
+    DrawLooper::Builder drawLooperBuilder;
+    drawLooperBuilder.addShadow(shadowOffset, shadowBlur, shadowColor,
         DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
-    setDrawLooper(drawLooper);
+    setDrawLooper(*drawLooperBuilder.detachDrawLooper());
     fillRectWithRoundedHole(outerRect, roundedHole, fillColor);
     restore();
     clearDrawLooper();
 }
 
 // This is only used to draw borders.
 void GraphicsContext::drawLine(const IntPoint& point1, const IntPoint& point2)
 {
     if (paintingDisabled())
         return;
@@ skipping 1243 matching lines @@
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "PlatformContextSkia::trackTextRegion");
         m_textRegion.join(textRect);
     }
 }
 
 }