Don't clip composited scrolling contain:paint

third_party/WebKit/Source/core/paint/BoxClipper.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/BoxClipper.h"
 
 #include "core/layout/LayoutBox.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/PaintLayer.h"
@@ skipping 18 matching lines @@
         const auto* objectProperties = m_box.objectPaintProperties();
         if (objectProperties && objectProperties->overflowClip()) {
             PaintChunkProperties properties(paintInfo.context.getPaintController().currentPaintChunkProperties());
             properties.clip = objectProperties->overflowClip();
             m_scopedClipProperty.emplace(paintInfo.context.getPaintController(), properties);
         }
         return;
     }
 
     bool isControlClip = m_box.hasControlClip();
-    bool isOverflowOrContainmentClip = (m_box.hasOverflowClip() && !m_box.layer()->isSelfPaintingLayer())
-        || m_box.style()->containsPaint();
+    bool isOverflowOrContainmentClip = (m_box.hasOverflowClip() || box.styleRef().containsPaint()) && !m_box.layer()->isSelfPaintingLayer();
 
     if (!isControlClip && !isOverflowOrContainmentClip)
         return;
 
     LayoutRect clipRect = isControlClip ? m_box.controlClipRect(accumulatedOffset) : m_box.overflowClipRect(accumulatedOffset);
     FloatRoundedRect clipRoundedRect(0, 0, 0, 0);
     bool hasBorderRadius = m_box.style()->hasBorderRadius();
     if (hasBorderRadius)
         clipRoundedRect = m_box.style()->getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, m_box.size()));
 
@@ skipping 26 matching lines @@
 BoxClipper::~BoxClipper()
 {
     if (m_clipType == DisplayItem::UninitializedType)
         return;
 
     ASSERT(m_box.hasControlClip() || (m_box.hasOverflowClip() && !m_box.layer()->isSelfPaintingLayer()) || m_box.style()->containsPaint());
     m_paintInfo.context.getPaintController().endItem<EndClipDisplayItem>(m_box, DisplayItem::clipTypeToEndClipType(m_clipType));
 }
 
 } // namespace blink