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 8d68e46828114ae148889c7e4f7d0ed0663eb0eb..8360f92684d2713eda3657606fa82fe73dcfca8b 100644
--- a/Source/core/paint/CompositingRecorder.cpp
+++ b/Source/core/paint/CompositingRecorder.cpp
@@ -31,7 +31,7 @@ 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()->createAndAppendIfNeeded<BeginCompositingDisplayItem>(client, xferMode, opacity, bounds, colorFilter);
     } else {
         BeginCompositingDisplayItem beginCompositingDisplayItem(client, xferMode, opacity, bounds, colorFilter);
         beginCompositingDisplayItem.replay(graphicsContext);
@@ -44,7 +44,7 @@ void CompositingRecorder::endCompositing(GraphicsContext& graphicsContext, const
         ASSERT(graphicsContext.displayItemList());
         if (graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
             return;
-        graphicsContext.displayItemList()->add(EndCompositingDisplayItem::create(client));
+        graphicsContext.displayItemList()->createAndAppendIfNeeded<EndCompositingDisplayItem>(client);
     } else {
         EndCompositingDisplayItem endCompositingDisplayItem(client);
         endCompositingDisplayItem.replay(graphicsContext);