[LayoutNG] flag-specific rebaselines

From the review of build 8882.

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

Bug: 591099
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I013dc2010ed440008bd76ce6afdb3f0e0d920dcb
Reviewed-on: https://chromium-review.googlesource.com/1175756
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583356}
4 files changed