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Root cause of missing invalidations:
LayoutObject::AdjustStyleDifference was not marking LayoutText with NG rendering
as NeedPaintInvalidation. This caused invalidation not to propagate to document.
It was not marked because
LayoutObject:1789 ToLayoutText(this)->HasTextBoxes() always returned false for NG.

The fix was to make HasTextBoxes() NG-aware. This caused 2 callers
of HasTextBoxes() to behave incorrectly. Created HasLegacyTextBoxes(),
and added a TODO to remove them.

Bug: 819372
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: If2c4ddc0c9c707d11bb9115ef26ac578387c8359
Reviewed-on: https://chromium-review.googlesource.com/961526
Commit-Queue: Aleks Totic <atotic@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543885}