WIP for display item list backed by ListContainer

Source/core/paint/ScrollRecorder.cpp

Index: Source/core/paint/ScrollRecorder.cpp
diff --git a/Source/core/paint/ScrollRecorder.cpp b/Source/core/paint/ScrollRecorder.cpp
index cdcf9d7f2f17153d57375149e180c5ecf4554191..a2b18ae1a7d13e6679d5c8456138ca7be87d935f 100644
--- a/Source/core/paint/ScrollRecorder.cpp
+++ b/Source/core/paint/ScrollRecorder.cpp
@@ -17,32 +17,35 @@ ScrollRecorder::ScrollRecorder(GraphicsContext& context, const DisplayItemClient
     , m_beginItemType(DisplayItem::paintPhaseToScrollType(phase))
     , m_context(context)
 {
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        ASSERT(m_context.displayItemList());
-        if (m_context.displayItemList()->displayItemConstructionIsDisabled())
-            return;
-        m_context.displayItemList()->add(BeginScrollDisplayItem::create(m_client, m_beginItemType, currentOffset));
-    } else {
-        BeginScrollDisplayItem scrollDisplayItem(m_client, m_beginItemType, currentOffset);
-        scrollDisplayItem.replay(m_context);
-    }
+    ALLOW_UNUSED_LOCAL(m_client);
+    ALLOW_UNUSED_LOCAL(m_beginItemType);
+    ALLOW_UNUSED_LOCAL(m_context);
+    //if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
+    //    ASSERT(m_context.displayItemList());
+    //    if (m_context.displayItemList()->displayItemConstructionIsDisabled())
+    //        return;
+    //    m_context.displayItemList()->add(BeginScrollDisplayItem::create(m_client, m_beginItemType, currentOffset));
+    //} else {
+    //    BeginScrollDisplayItem scrollDisplayItem(m_client, m_beginItemType, currentOffset);
+    //    scrollDisplayItem.replay(m_context);
+    //}
 }
 
 ScrollRecorder::~ScrollRecorder()
 {
-    DisplayItem::Type endItemType = DisplayItem::scrollTypeToEndScrollType(m_beginItemType);
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        ASSERT(m_context.displayItemList());
-        if (!m_context.displayItemList()->displayItemConstructionIsDisabled()) {
-            if (m_context.displayItemList()->lastDisplayItemIsNoopBegin())
-                m_context.displayItemList()->removeLastDisplayItem();
-            else
-                m_context.displayItemList()->add(EndScrollDisplayItem::create(m_client, endItemType));
-        }
-    } else {
-        EndScrollDisplayItem endScrollDisplayItem(m_client, endItemType);
-        endScrollDisplayItem.replay(m_context);
-    }
+    //DisplayItem::Type endItemType = DisplayItem::scrollTypeToEndScrollType(m_beginItemType);
+    //if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
+    //    ASSERT(m_context.displayItemList());
+    //    if (!m_context.displayItemList()->displayItemConstructionIsDisabled()) {
+    //        if (m_context.displayItemList()->lastDisplayItemIsNoopBegin())
+    //            m_context.displayItemList()->removeLastDisplayItem();
+    //        else
+    //            m_context.displayItemList()->add(EndScrollDisplayItem::create(m_client, endItemType));
+    //    }
+    //} else {
+    //    EndScrollDisplayItem endScrollDisplayItem(m_client, endItemType);
+    //    endScrollDisplayItem.replay(m_context);
+    //}
 }
 
 } // namespace blink