commit 800d47b989ca8294fc63f5a921c26418a98c8b72
author Koji Ishii <kojii@chromium.org> Wed Sep 12 08:39:49 2018
committer Commit Bot <commit-bot@chromium.org> Wed Sep 12 08:39:49 2018
tree 67aeb2ed59542d054c291748ce4fc897e45d6bbf
parent 7ec97292669288fff06627bb7c88745a8481401e

[LayoutNG] Fix scrollWidth/scrollLeft when children are not inline

r590138 (CL:1215365) fixed scrollWidth when box is narrower
than the scrollbar width, but the apporach had two problems:

1. It does not fix if children are not inline, because
   LayoutNGMixin::AddOverflowFromChildren() computes overflow
   from fragments only when children are inline, but
   delegates to LayoutObject if otherwise.
2. scrollWidth was fixed, but scrollLeft is still incorrect
   in some cases. This causes LayoutObject to compute
   incorrect scrollWidth.

Instead of adjusting overflow, this patch adjusts inline
offset of fragments by clamping the scrollbar inline size to
the content box.

This method computes scrollWidth/scrollLeft same as legacy
regardless of children.

Bug: 635619
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I401b245400b7a3fb2717bdcb5cdaa8edd34d928e
Reviewed-on: https://chromium-review.googlesource.com/1217920
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590622}