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

Source/core/paint/LayerFixedPositionRecorder.cpp

Index: Source/core/paint/LayerFixedPositionRecorder.cpp
diff --git a/Source/core/paint/LayerFixedPositionRecorder.cpp b/Source/core/paint/LayerFixedPositionRecorder.cpp
index 966c99925587a33f5481c0efa860ab0e7d717692..a9ff53ca4187d8b00b4de648d4bc9430b6981a38 100644
--- a/Source/core/paint/LayerFixedPositionRecorder.cpp
+++ b/Source/core/paint/LayerFixedPositionRecorder.cpp
@@ -26,14 +26,18 @@ LayerFixedPositionRecorder::LayerFixedPositionRecorder(GraphicsContext& graphics
     if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
         return;
 
-    if (m_isFixedPosition)
-        m_graphicsContext.displayItemList()->add(BeginFixedPositionDisplayItem::create(m_layoutObject));
+    if (m_isFixedPosition) {
+        BeginFixedPositionDisplayItem beginFixed(m_layoutObject);
+        m_graphicsContext.displayItemList()->add(beginFixed);
+    }
 
     // TODO(trchen): Adding a pair of display items on every transformed
     // element can be expensive. Investigate whether we can optimize out some
     // of them if applicable.
-    if (m_isFixedPositionContainer)
-        m_graphicsContext.displayItemList()->add(BeginFixedPositionContainerDisplayItem::create(m_layoutObject));
+    if (m_isFixedPositionContainer) {
+        BeginFixedPositionContainerDisplayItem beginContainer(m_layoutObject);
+        m_graphicsContext.displayItemList()->add(beginContainer);
+    }
 }
 
 LayerFixedPositionRecorder::~LayerFixedPositionRecorder()
@@ -44,11 +48,15 @@ LayerFixedPositionRecorder::~LayerFixedPositionRecorder()
     if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
         return;
 
-    if (m_isFixedPositionContainer)
-        m_graphicsContext.displayItemList()->add(EndFixedPositionContainerDisplayItem::create(m_layoutObject));
+    if (m_isFixedPositionContainer) {
+        EndFixedPositionContainerDisplayItem endContainer(m_layoutObject);
+        m_graphicsContext.displayItemList()->add(endContainer);
+    }
 
-    if (m_isFixedPosition)
-        m_graphicsContext.displayItemList()->add(EndFixedPositionDisplayItem::create(m_layoutObject));
+    if (m_isFixedPosition) {
+        EndFixedPositionDisplayItem endFixed(m_layoutObject);
+        m_graphicsContext.displayItemList()->add(endFixed);
+    }
 }
 
 } // namespace blink