WIP for display item list backed by ListContainer

Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp

Index: Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
diff --git a/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp b/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
index 4b1ef4df0d2a50e0abae356538608ad271ee726b..75d4d7e517b86057fdaf7ebb0c673c1bf0723a0f 100644
--- a/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
+++ b/Source/core/layout/compositing/CompositedDeprecatedPaintLayerMapping.cpp
@@ -2130,29 +2130,29 @@ void CompositedDeprecatedPaintLayerMapping::doPaintTask(const GraphicsLayerPaint
         // FIXME: Combine similar code here and LayerClipRecorder.
         dirtyRect.intersect(paintInfo.localClipRectForSquashedLayer);
         {
-            if (context->displayItemList()) {
-                ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
-                if (!context->displayItemList()->displayItemConstructionIsDisabled())
-                    context->displayItemList()->add(ClipDisplayItem::create(*this, DisplayItem::ClipLayerOverflowControls, dirtyRect));
-            } else {
-                OwnPtr<DisplayItem> clipDisplayItem = ClipDisplayItem::create(*this, DisplayItem::ClipLayerOverflowControls, dirtyRect);
-                clipDisplayItem->replay(*context);
-            }
+            //if (context->displayItemList()) {
+            //    ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
+            //    if (!context->displayItemList()->displayItemConstructionIsDisabled())
+            //        context->displayItemList()->add(ClipDisplayItem::create(*this, DisplayItem::ClipLayerOverflowControls, dirtyRect));
+            //} else {
+            //    OwnPtr<DisplayItem> clipDisplayItem = ClipDisplayItem::create(*this, DisplayItem::ClipLayerOverflowControls, dirtyRect);
+            //    clipDisplayItem->replay(*context);
+            //}
         }
         DeprecatedPaintLayerPainter(*paintInfo.paintLayer).paintLayer(context, paintingInfo, paintLayerFlags);
         {
-            if (context->displayItemList()) {
-                ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
-                if (!context->displayItemList()->displayItemConstructionIsDisabled()) {
-                    if (context->displayItemList()->lastDisplayItemIsNoopBegin())
-                        context->displayItemList()->removeLastDisplayItem();
-                    else
-                        context->displayItemList()->add(EndClipDisplayItem::create(*this, DisplayItem::clipTypeToEndClipType(DisplayItem::ClipLayerOverflowControls)));
-                }
-            } else {
-                OwnPtr<DisplayItem> endClipDisplayItem = EndClipDisplayItem::create(*this, DisplayItem::clipTypeToEndClipType(DisplayItem::ClipLayerOverflowControls));
-                endClipDisplayItem->replay(*context);
-            }
+            //if (context->displayItemList()) {
+            //    ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
+            //    if (!context->displayItemList()->displayItemConstructionIsDisabled()) {
+            //        if (context->displayItemList()->lastDisplayItemIsNoopBegin())
+            //            context->displayItemList()->removeLastDisplayItem();
+            //        else
+            //            context->displayItemList()->add(EndClipDisplayItem::create(*this, DisplayItem::clipTypeToEndClipType(DisplayItem::ClipLayerOverflowControls)));
+            //    }
+            //} else {
+            //    OwnPtr<DisplayItem> endClipDisplayItem = EndClipDisplayItem::create(*this, DisplayItem::clipTypeToEndClipType(DisplayItem::ClipLayerOverflowControls));
+            //    endClipDisplayItem->replay(*context);
+            //}
         }
     }
 }