Turn off Clip Rect caching for elements under sticky positioned elements

For elements inside sticky positioned containers that were scrolled, the
cached clip rect did not previously update the scroll position. That
meant that the clip rect did not move with the contents, resulting in
incorrect overlap checks in some cases. To fix this, we have to turn
off caching for elements inside sticky positioned elements, because in
that case the scroll is sometimes included and sometimes not, depending
on whether the sticky constraint is binding.

Bug: 942097, 931853, 935525
Change-Id: Ibd5810c23c8d92b6047709ed06f832acd4770a0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1526680
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642524}
6 files changed