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Table section paints table col's background on its display item, so when
table col's background changes, we invalidate all table sections.
See https://cs.chromium.org/chromium/src/third_party/blink/renderer/core/paint/table_paint_invalidator.cc?rcl=597a899086d4baebb543eb55b7bd283a3b2068a1&l=43

Now let LayoutObject::BackgroundChangedSinceLastPaintInvalidation() be
initially true, so that a new col will be treated as background changed.

Bug: 837258
Change-Id: Ic8efcbeb45ee879106f045b262fc4ee8e27cf891
Reviewed-on: https://chromium-review.googlesource.com/1043350Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556266}