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a146225331
Add unsafe_layout_node(), unsafe_paintable(), and unsafe_paintable_box() accessors that skip layout-staleness verification. These are for use in contexts where accessing layout/paintable data is legitimate despite layout not being up to date: tree construction, style recalculation, painting, animation interpolation, DOM mutation, and invalidation propagation. Also add wrapper APIs on Node to centralize common patterns: - set_needs_display() wraps if (unsafe_paintable()) ...set_needs_display - set_needs_paint_only_properties_update() wraps similar - set_needs_layout_update() wraps if (unsafe_layout_node()) ... And add Document::layout_is_up_to_date() which checks whether layout tree update flags are all clear.