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LayoutNG paints hit test display items with NGPhysicalLineBoxFragment
display item clients in NGBoxFragmentPainter::PaintLineBox. With this
patch, these line box fragments are now invalidated via the block flow
invalidation. This fixes touch-rect-crash-on-unpromote-layer.html with
CompositeAfterPaint.

Change-Id: Id1c1961d2acdfe5638134f9b3e44dcaeae6a65cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984874Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728189}