Traverse into child LayoutViews during invalidateTreeIfNeeded

Source/core/layout/PaintInvalidationState.h

Index: Source/core/layout/PaintInvalidationState.h
diff --git a/Source/core/layout/PaintInvalidationState.h b/Source/core/layout/PaintInvalidationState.h
index 4d71e206cb842e1c95052d71bdc729faa6e6d579..6d812d5e3d12c07a7297315fb005a44d1762d9fa 100644
--- a/Source/core/layout/PaintInvalidationState.h
+++ b/Source/core/layout/PaintInvalidationState.h
@@ -22,7 +22,10 @@ public:
     PaintInvalidationState(PaintInvalidationState& next, LayoutBoxModelObject& layoutObject, const LayoutBoxModelObject& paintInvalidationContainer);
     PaintInvalidationState(PaintInvalidationState& next, const LayoutSVGModelObject& layoutObject);
 
-    explicit PaintInvalidationState(const LayoutView&, Vector<LayoutObject*>& pendingDelayedPaintInvalidations);
+    PaintInvalidationState(const LayoutView& layoutView, Vector<LayoutObject*>& pendingDelayedPaintInvalidations)
+        : PaintInvalidationState(layoutView, pendingDelayedPaintInvalidations, nullptr) { }
+    PaintInvalidationState(const LayoutView& layoutView, PaintInvalidationState& ownerPaintInvalidationState)
+        : PaintInvalidationState(layoutView, ownerPaintInvalidationState.m_pendingDelayedPaintInvalidations, &ownerPaintInvalidationState) { }
 
     const LayoutRect& clipRect() const { return m_clipRect; }
     const LayoutSize& paintOffset() const { return m_paintOffset; }
@@ -46,6 +49,8 @@ public:
     Vector<LayoutObject*>& pendingDelayedPaintInvalidationTargets() { return m_pendingDelayedPaintInvalidations; }
 
 private:
+    PaintInvalidationState(const LayoutView&, Vector<LayoutObject*>& pendingDelayedPaintInvalidations, PaintInvalidationState* ownerPaintInvalidationState);
+
     void applyClipIfNeeded(const LayoutObject&);
     void addClipRectRelativeToPaintOffset(const LayoutSize& clipSize);