tree 379a496a57d323327afa28fd5f1c4714f37ff81e
parent ab8c7f758c1f0d10ee5b7ede0fcac6606c40421b
author Ethan Jimenez <ethavar@microsoft.com> 1681516414 -0700
committer Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> 1681517086 -0700

[GridNG] Add extra margins to a subgridded item's contribution size

1. Introducing fields in `NGGridLayoutTrackCollection` to accumulate the
   start/end extra margin from subgrids, which will be used to compute
   the respective extra margin to be added to subgridded items.

   Also adding methods to compute the start/end extra margins to be
   applied to specific track spans within a track collection.

2. Adding the start/end extra margin to a subgridded item's contribution
   size. This extra margin will accommodate any ancestor subgrid's
   margin, border, scrollbar, padding, and gutter size.

3. Correcting an invalid definition for `grid-column` in the WPT test
   `auto-track-sizing-001.html` and its respective reference file.

Bug: 618969
Change-Id: I4c9c1264d91939b35a758afd00e081ed4d7bdb2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4421571
Reviewed-by: Alison Maher <almaher@microsoft.com>
Commit-Queue: Ethan Jimenez <ethavar@microsoft.com>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1130742}