Blink-side contiguous allocation of display items.

Source/core/paint/SubtreeRecorder.cpp

Index: Source/core/paint/SubtreeRecorder.cpp
diff --git a/Source/core/paint/SubtreeRecorder.cpp b/Source/core/paint/SubtreeRecorder.cpp
index 4a2e464f2139241d1a8cc55b0917b1eec223e5e2..d748e39196b2ec755fa19617c2445772bff6523f 100644
--- a/Source/core/paint/SubtreeRecorder.cpp
+++ b/Source/core/paint/SubtreeRecorder.cpp
@@ -34,7 +34,7 @@ SubtreeRecorder::~SubtreeRecorder()
         if (m_displayItemList->lastDisplayItemIsNoopBegin())
             m_displayItemList->removeLastDisplayItem();
         else
-            m_displayItemList->add(EndSubtreeDisplayItem::create(m_subtreeRoot, DisplayItem::paintPhaseToEndSubtreeType(m_paintPhase)));
+            m_displayItemList->createAndAppend<EndSubtreeDisplayItem>(m_subtreeRoot, DisplayItem::paintPhaseToEndSubtreeType(m_paintPhase));
     }
 }
 
@@ -44,7 +44,7 @@ void SubtreeRecorder::begin()
         return;
     if (m_displayItemList->displayItemConstructionIsDisabled())
         return;
-    m_displayItemList->add(BeginSubtreeDisplayItem::create(m_subtreeRoot, DisplayItem::paintPhaseToBeginSubtreeType(m_paintPhase)));
+    m_displayItemList->createAndAppend<BeginSubtreeDisplayItem>(m_subtreeRoot, DisplayItem::paintPhaseToBeginSubtreeType(m_paintPhase));
     m_begun = true;
 }