[LayoutNG] flag-specific rebaselines for paint/invalidation/

Following r573229 (CL:1128677), this patch rebaselines tests
in paint/invalidations that match to the following criteria:
1. The invalidation images match (or less because line boxes
   maybe narrower in NG.)
2. They are ref tests; i.e., they have -expected.html.
   These ref files are added in crbug.com/611462.

Splitted the rebaseline CL for ref tests to ensure tests pass
after the -expected.txt rebaselines for ref tests.

TBR=eae@chromium.org, mstensho@chromium.org, atotic@chromium.org, wangxianzhu@chromium.org
NOTRY=true

Bug: 591099
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I585c68008ea48caba48e04a64a030827bdb23424
Reviewed-on: https://chromium-review.googlesource.com/1128683
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573617}
65 files changed