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

Source/core/paint/TransformRecorder.cpp

Index: Source/core/paint/TransformRecorder.cpp
diff --git a/Source/core/paint/TransformRecorder.cpp b/Source/core/paint/TransformRecorder.cpp
index fb96a941228b0fbed9bb6c0919fb17b6c7d08ed9..369fd1628a212f27eec46fa3e599859f9c9aa791 100644
--- a/Source/core/paint/TransformRecorder.cpp
+++ b/Source/core/paint/TransformRecorder.cpp
@@ -21,13 +21,13 @@ TransformRecorder::TransformRecorder(GraphicsContext& context, const DisplayItem
     if (m_skipRecordingForIdentityTransform)
         return;
 
+    BeginTransformDisplayItem beginTransform(m_client, transform);
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context.displayItemList());
         if (m_context.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context.displayItemList()->add(BeginTransformDisplayItem::create(m_client, transform));
+        m_context.displayItemList()->add(beginTransform);
     } else {
-        BeginTransformDisplayItem beginTransform(m_client, transform);
         beginTransform.replay(m_context);
     }
 }
@@ -37,13 +37,13 @@ TransformRecorder::~TransformRecorder()
     if (m_skipRecordingForIdentityTransform)
         return;
 
+    EndTransformDisplayItem endTransform(m_client);
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context.displayItemList());
         if (m_context.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        m_context.displayItemList()->add(EndTransformDisplayItem::create(m_client));
+        m_context.displayItemList()->add(endTransform);
     } else {
-        EndTransformDisplayItem endTransform(m_client);
         endTransform.replay(m_context);
     }
 }