[SPv2] Triage paint/invalidation test failures

Put them into groups each with similar failure reasons.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I336759633b5377469527250076c5a3a3f96ee56b
Reviewed-on: https://chromium-review.googlesource.com/624456
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496218}
1 file changed