Blink-side contiguous allocation of display items.

Source/core/layout/svg/LayoutSVGResourceClipper.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  * Copyright (C) 2011 Dirk Schulze <krit@webkit.org>
  *
  * 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 119 matching lines @@
         transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
         transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         clipPath.transform(transform);
     }
 
     // Transform path by animatedLocalTransform.
     clipPath.transform(animatedLocalTransform);
 
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         if (!context->displayItemList()->displayItemConstructionIsDisabled())
-            context->displayItemList()->add(BeginClipPathDisplayItem::create(layoutObject, clipPath));
+            context->displayItemList()->createAndAppendIfNeeded<BeginClipPathDisplayItem>(layoutObject, clipPath);
     } else {
         BeginClipPathDisplayItem clipPathDisplayItem(layoutObject, clipPath);
         clipPathDisplayItem.replay(*context);
     }
 
     return true;
 }
 
 PassRefPtr<const SkPicture> LayoutSVGResourceClipper::createContentPicture(AffineTransform& contentTransformation, const FloatRect& targetBoundingBox,
     GraphicsContext* context)
@@ skipping 118 matching lines @@
         AffineTransform transform;
         transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
         transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
         return transform.mapRect(m_clipBoundaries);
     }
 
     return m_clipBoundaries;
 }
 
 }