Traverse into child LayoutViews during invalidateTreeIfNeeded

Source/core/layout/LayoutView.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 165 matching lines @@
 
     double layoutViewportWidth() const;
     double layoutViewportHeight() const;
 
     void pushLayoutState(LayoutState& layoutState) { m_layoutState = &layoutState; }
     void popLayoutState() { ASSERT(m_layoutState); m_layoutState = m_layoutState->next(); }
     virtual void invalidateTreeIfNeeded(PaintInvalidationState&) override final;
 
     virtual LayoutRect visualOverflowRect() const override;
 
+    bool forceCheckForPaintInvalidationByParent() const { return !isPaintInvalidationContainer() && m_forceCheckForPaintInvalidationByParent; }
+    void setForceCheckForPaintInvalidationByParent(bool b) { ASSERT(!isPaintInvalidationContainer()); m_forceCheckForPaintInvalidationByParent = b; }
+    bool paintInvalidationCachedOffsetsEnabledByParent() const { return isPaintInvalidationContainer() || m_paintInvalidationCachedOffsetsEnabledByParent; }
+    void setPaintInvalidationCachedOffsetsEnabledByParent(bool b) { ASSERT(!isPaintInvalidationContainer()); m_paintInvalidationCachedOffsetsEnabledByParent = b; }
+
 private:
     virtual void mapLocalToContainer(const LayoutBoxModelObject* paintInvalidationContainer, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = nullptr, const PaintInvalidationState* = nullptr) const override;
 
     template <typename Strategy>
     void commitPendingSelectionAlgorithm();
 
     virtual const LayoutObject* pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&) const override;
     virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override;
     virtual void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
 
@@ skipping 24 matching lines @@
     RefPtr<IntervalArena> m_intervalArena;
 
     LayoutQuote* m_layoutQuoteHead;
     unsigned m_layoutCounterCount;
 
     unsigned m_hitTestCount;
     unsigned m_hitTestCacheHits;
     OwnPtrWillBePersistent<HitTestCache> m_hitTestCache;
 
     OwnPtrWillBePersistent<PendingSelection> m_pendingSelection;
+
+    // Set during parent LayoutView's paint invalidation. Checked during its own paint invalidation.
+    // They are ignored if this LayoutView is paint invalidation container.
+    bool m_forceCheckForPaintInvalidationByParent;
+    bool m_paintInvalidationCachedOffsetsEnabledByParent;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutView, isLayoutView());
 
 // Suspends the LayoutState cached offset and clipRect optimization. Used under transforms
 // that cannot be represented by LayoutState (common in SVG) and when manipulating the layout
 // tree during layout in ways that can trigger paint invalidation of a non-child (e.g. when a list item
 // moves its list marker around). Note that even when disabled, LayoutState is still used to
 // store layoutDelta.
 class ForceHorriblySlowRectMapping {
@@ skipping 13 matching lines @@
             m_paintInvalidationState->m_cachedOffsetsEnabled = true;
     }
 private:
     const PaintInvalidationState* m_paintInvalidationState;
     bool m_didDisable;
 };
 
 } // namespace blink
 
 #endif // LayoutView_h