Generate scroll/clip display item hierarchy for SPv2

Source/core/paint/LayerClipRecorder.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/LayerClipRecorder.h"
 
 #include "core/layout/ClipRect.h"
 #include "core/layout/LayoutView.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/paint/ClipRecorder.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 
 namespace blink {
 
 LayerClipRecorder::LayerClipRecorder(GraphicsContext& graphicsContext, const LayoutBoxModelObject& layoutObject, DisplayItem::Type clipType, const ClipRect& clipRect,
     const DeprecatedPaintLayerPaintingInfo* localPaintingInfo, const LayoutPoint& fragmentOffset, PaintLayerFlags paintFlags, BorderRadiusClippingRule rule)
     : m_graphicsContext(graphicsContext)
     , m_layoutObject(layoutObject)
     , m_clipType(clipType)
 {
+    ASSERT(!RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+
     IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
     Vector<FloatRoundedRect> roundedRects;
     if (localPaintingInfo && clipRect.hasRadius()) {
         collectRoundedRectClips(*layoutObject.layer(), *localPaintingInfo, graphicsContext, fragmentOffset, paintFlags, rule, roundedRects);
     }
 
     ASSERT(m_graphicsContext.displayItemList());
     if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled())
         return;
     m_graphicsContext.displayItemList()->createAndAppend<ClipDisplayItem>(layoutObject, m_clipType, snappedClipRect, roundedRects);
@@ skipping 43 matching lines @@
     ASSERT(m_graphicsContext.displayItemList());
     if (!m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled()) {
         if (m_graphicsContext.displayItemList()->lastDisplayItemIsNoopBegin())
             m_graphicsContext.displayItemList()->removeLastDisplayItem();
         else
             m_graphicsContext.displayItemList()->createAndAppend<EndClipDisplayItem>(m_layoutObject, DisplayItem::clipTypeToEndClipType(m_clipType));
     }
 }
 
 } // namespace blink