[SPv2] Stop recording paired display items (except for subsequence markers)

third_party/WebKit/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 "core/paint/LayerClipRecorder.h"
 
 #include "core/layout/LayoutView.h"
 #include "core/paint/ClipRect.h"
 #include "core/paint/PaintLayer.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/PaintController.h"
 
 namespace blink {
 
 LayerClipRecorder::LayerClipRecorder(GraphicsContext& graphicsContext,
                                      const LayoutBoxModelObject& layoutObject,
                                      DisplayItem::Type clipType,
                                      const ClipRect& clipRect,
                                      const PaintLayer* clipRoot,
                                      const LayoutPoint& fragmentOffset,
                                      PaintLayerFlags paintFlags,
                                      BorderRadiusClippingRule rule)
     : m_graphicsContext(graphicsContext),
       m_layoutObject(layoutObject),
       m_clipType(clipType) {
+  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+    return;
   IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect());
   Vector<FloatRoundedRect> roundedRects;
   if (clipRoot && clipRect.hasRadius()) {
     collectRoundedRectClips(*layoutObject.layer(), clipRoot, graphicsContext,
                             fragmentOffset, paintFlags, rule, roundedRects);
   }
 
   m_graphicsContext.getPaintController().createAndAppend<ClipDisplayItem>(
       layoutObject, m_clipType, snappedClipRect, roundedRects);
 }
@@ skipping 58 matching lines @@
           layer->layoutObject().style()->getRoundedInnerBorderFor(
               LayoutRect(delta, size)));
     }
 
     if (layer == clipRoot)
       break;
   }
 }
 
 LayerClipRecorder::~LayerClipRecorder() {
+  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+    return;
   m_graphicsContext.getPaintController().endItem<EndClipDisplayItem>(
       m_layoutObject, DisplayItem::clipTypeToEndClipType(m_clipType));
 }
 
 }  // namespace blink