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In the collapsed table borders model, all borders (from the table
itself, table sections, table columns, table rows and table cells) are
painted in the background-and-borders phase of the table. We need
special code to prevent the background of a self-painting-layer
table-cell from overlapping with the borders that have already been
painted. Similar code exists for legacy in TableCellPainter.

Bug: 869878
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I190dd6a152e751f6b30409104fb466ca46bb9024
Reviewed-on: https://chromium-review.googlesource.com/c/1289890
Commit-Queue: David Grogan <dgrogan@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600959}