GitLab

Main fix is to fix painting of self-painting AtomicInlines.
self-painting AtomicInlines must paint their background
in background phase.

This also fixed several other tests. Rebaselined their
txt expectations.

Bug: 714962
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: Ibaff3c6a681fec81101cb4b8d67877302d74ddff
Reviewed-on: https://chromium-review.googlesource.com/1112673Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570128}