[Slimming Paint] Blink-side contiguous allocation of display items.

Source/core/paint/Transform3DRecorder.cpp

Index: Source/core/paint/Transform3DRecorder.cpp
diff --git a/Source/core/paint/Transform3DRecorder.cpp b/Source/core/paint/Transform3DRecorder.cpp
index be8b29e39adbd0ad8bf6b656f75bd5cda1d3833c..7a7780950a63eb17bb779bc884318e804bbbc247 100644
--- a/Source/core/paint/Transform3DRecorder.cpp
+++ b/Source/core/paint/Transform3DRecorder.cpp
@@ -23,13 +23,13 @@ Transform3DRecorder::Transform3DRecorder(GraphicsContext& context, const Display
     if (m_skipRecordingForIdentityTransform)
         return;
 
+    BeginTransform3DDisplayItem beginTransform(m_client, m_type, transform);
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context.displayItemList());
         if (m_context.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context.displayItemList()->add(BeginTransform3DDisplayItem::create(m_client, m_type, transform));
+        m_context.displayItemList()->add(beginTransform);
     } else {
-        BeginTransform3DDisplayItem beginTransform(m_client, m_type, transform);
         beginTransform.replay(m_context);
     }
 }
@@ -40,13 +40,13 @@ Transform3DRecorder::~Transform3DRecorder()
         return;
 
     DisplayItem::Type endType = DisplayItem::transform3DTypeToEndTransform3DType(m_type);
+    EndTransform3DDisplayItem endTransform(m_client, endType);
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context.displayItemList());
         if (m_context.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context.displayItemList()->add(EndTransform3DDisplayItem::create(m_client, endType));
+        m_context.displayItemList()->add(endTransform);
     } else {
-        EndTransform3DDisplayItem endTransform(m_client, endType);
         endTransform.replay(m_context);
     }
 }