Blink-side contiguous allocation of display items.

Source/core/paint/CompositingRecorder.cpp

Index: Source/core/paint/CompositingRecorder.cpp
diff --git a/Source/core/paint/CompositingRecorder.cpp b/Source/core/paint/CompositingRecorder.cpp
index 874e65c4bd87074ab22d9929c3a63b1231bea5b5..9268a08f0f455fd12610dd9c26ad66a88ff4d5d2 100644
--- a/Source/core/paint/CompositingRecorder.cpp
+++ b/Source/core/paint/CompositingRecorder.cpp
@@ -31,10 +31,10 @@ void CompositingRecorder::beginCompositing(GraphicsContext& graphicsContext, con
         ASSERT(graphicsContext.displayItemList());
         if (graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        graphicsContext.displayItemList()->add(BeginCompositingDisplayItem::create(client, xferMode, opacity, bounds, colorFilter));
+        graphicsContext.displayItemList()->createAndAppend<BeginCompositingDisplayItem>(client, xferMode, opacity, bounds, colorFilter);
     } else {
-        BeginCompositingDisplayItem beginCompositingDisplayItem(client, xferMode, opacity, bounds, colorFilter);
-        beginCompositingDisplayItem.replay(graphicsContext);
+        BeginCompositingDisplayItem compositingDisplayItem(client, xferMode, opacity, bounds, colorFilter);
+        compositingDisplayItem.replay(graphicsContext);
     }
 }
 
@@ -46,7 +46,7 @@ void CompositingRecorder::endCompositing(GraphicsContext& graphicsContext, const
             if (graphicsContext.displayItemList()->lastDisplayItemIsNoopBegin())
                 graphicsContext.displayItemList()->removeLastDisplayItem();
             else
-                graphicsContext.displayItemList()->add(EndCompositingDisplayItem::create(client));
+                graphicsContext.displayItemList()->createAndAppend<EndCompositingDisplayItem>(client);
         }
     } else {
         EndCompositingDisplayItem endCompositingDisplayItem(client);