tree cf622a90bd16782782dd53b80519f438d7ee9c15
parent 3d0650560de262882e8836a5295e42ac048d403c
author Philip Rogers <pdr@chromium.org> 1652200290 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1652200769 -0700

Reland "Do not eagerly mark ancestors for repaint" with stacking bugfix

This patch relands https://crrev.com/984798 which was reverted due to
https://crbug.com/1323016. PaintLayer has a bit for self needing repaint
as well as a bit for descendant needing repaint. When marking a
PaintLayer for repaint, the ancestor chain (following stacking contexts)
is marked as having a descendant needing repaint. When stacking
contexts changed, we failed to maintain the descendant bits on the new
ancestor chain.

Bug: 1323016
Change-Id: I8a27b180b6a468a5107edf0fed1008a1d00e8753
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3632833
Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1001525}