merge_pr_52981

[soft navs] Leaf distant from attached node satisfies paint criterion.

Adds a test that passes with advanced paint attribution but fails
without it.

By default, advanced paint attribution is switched on for the WPT tests
in Chromium; for run_wpt_tests.py, I verified that the test fails by
switching it off explicitly:

third_party/blink/tools/run_wpt_tests.py
--additional-driver-flag=--disable-features=SoftNavigationDetectionAdvancedPaintAttribution

Change-Id: I7b504465329be16e8743a211b62f48d49eacc75e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6619667
Commit-Queue: Johannes Henkel johannes@chromium.org
Reviewed-by: Michal Mocny mmocny@chromium.org
Cr-Commit-Position: refs/heads/main@{#1470046}