Blink-side contiguous allocation of display items.

Source/core/paint/RoundedInnerRectClipper.cpp

Index: Source/core/paint/RoundedInnerRectClipper.cpp
diff --git a/Source/core/paint/RoundedInnerRectClipper.cpp b/Source/core/paint/RoundedInnerRectClipper.cpp
index 3e0bfa03243402bd49ec8c221604a09af9ad0dda..79c27a63d3ffc2e483d1bba3ff2b6ccccc185efa 100644
--- a/Source/core/paint/RoundedInnerRectClipper.cpp
+++ b/Source/core/paint/RoundedInnerRectClipper.cpp
@@ -48,14 +48,14 @@ RoundedInnerRectClipper::RoundedInnerRectClipper(LayoutObject& layoutObject, con
         }
     }
 
-    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);
     }
 }
 
@@ -68,7 +68,7 @@ RoundedInnerRectClipper::~RoundedInnerRectClipper()
             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);