Blink-side contiguous allocation of display items.

Source/core/paint/RoundedInnerRectClipper.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/RoundedInnerRectClipper.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/graphics/paint/ClipDisplayItem.h"
@@ skipping 30 matching lines @@
             topCornerRadii.setTopRight(clipRect.radii().topRight());
             roundedRectClips->append(FloatRoundedRect(topCorner, topCornerRadii));
 
             FloatRect bottomCorner(clipRect.rect().x(), rect.y().toFloat(), rect.maxX() - clipRect.rect().x(), clipRect.rect().maxY() - rect.y().toFloat());
             FloatRoundedRect::Radii bottomCornerRadii;
             bottomCornerRadii.setBottomLeft(clipRect.radii().bottomLeft());
             roundedRectClips->append(FloatRoundedRect(bottomCorner, bottomCornerRadii));
         }
     }
 
-    OwnPtr<ClipDisplayItem> clipDisplayItem = ClipDisplayItem::create(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips.release());
     if (m_useDisplayItemList) {
         ASSERT(m_paintInfo.context->displayItemList());
         if (m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_paintInfo.context->displayItemList()->add(clipDisplayItem.release());
+        m_paintInfo.context->displayItemList()->createAndAppend<ClipDisplayItem>(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips.release());
     } else {
-        clipDisplayItem->replay(*paintInfo.context);
+        ClipDisplayItem clipDisplayItem(layoutObject, m_clipType, LayoutRect::infiniteIntRect(), roundedRectClips.release());
+        clipDisplayItem.replay(*paintInfo.context);
     }
 }
 
 RoundedInnerRectClipper::~RoundedInnerRectClipper()
 {
     DisplayItem::Type endType = DisplayItem::clipTypeToEndClipType(m_clipType);
     if (m_useDisplayItemList) {
         ASSERT(m_paintInfo.context->displayItemList());
         if (!m_paintInfo.context->displayItemList()->displayItemConstructionIsDisabled()) {
             if (m_paintInfo.context->displayItemList()->lastDisplayItemIsNoopBegin())
                 m_paintInfo.context->displayItemList()->removeLastDisplayItem();
             else
-                m_paintInfo.context->displayItemList()->add(EndClipDisplayItem::create(m_layoutObject, endType));
+                m_paintInfo.context->displayItemList()->createAndAppend<EndClipDisplayItem>(m_layoutObject, endType);
         }
     } else {
         EndClipDisplayItem endClipDisplayItem(m_layoutObject, endType);
         endClipDisplayItem.replay(*m_paintInfo.context);
     }
 }
 
 } // namespace blink