Generate scroll/clip display item hierarchy for SPv2

Source/core/paint/FilterPainter.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/FilterPainter.h"
 
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "core/paint/FilterEffectBuilder.h"
 #include "core/paint/LayerClipRecorder.h"
@@ skipping 34 matching lines @@
     }
 
     // We'll handle clipping to the dirty rect before filter rasterization.
     // Filter processing will automatically expand the clip rect and the offscreen to accommodate any filter outsets.
     // FIXME: It is incorrect to just clip to the damageRect here once multiple fragments are involved.
 
     // Subsequent code should not clip to the dirty rect, since we've already
     // done it above, and doing it later will defeat the outsets.
     paintingInfo.clipToDirtyRect = false;
 
-    if (clipRect.rect() != paintingInfo.paintDirtyRect || clipRect.hasRadius()) {
+    if ((clipRect.rect() != paintingInfo.paintDirtyRect || clipRect.hasRadius()) && !RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
         m_clipRecorder = adoptPtr(new LayerClipRecorder(*context, *layer.layoutObject(), DisplayItem::ClipLayerFilter, clipRect, &paintingInfo, LayoutPoint(), paintFlags));
     }
 
     ASSERT(m_layoutObject);
     ASSERT(context->displayItemList());
     if (!context->displayItemList()->displayItemConstructionIsDisabled()) {
         FilterOperations filterOperations(layer.computeFilterOperations(m_layoutObject->styleRef()));
         OwnPtr<WebFilterOperations> webFilterOperations = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
         builder.buildFilterOperations(filterOperations, webFilterOperations.get());
         // FIXME: It's possible to have empty WebFilterOperations here even
@@ skipping 16 matching lines @@
     ASSERT(m_context->displayItemList());
     if (!m_context->displayItemList()->displayItemConstructionIsDisabled()) {
         if (m_context->displayItemList()->lastDisplayItemIsNoopBegin())
             m_context->displayItemList()->removeLastDisplayItem();
         else
             m_context->displayItemList()->createAndAppend<EndFilterDisplayItem>(*m_layoutObject);
     }
 }
 
 } // namespace blink