[DL]: Allow containment checks to pass if we have no computed style.

In cases where we might not have computed style, ensure that we pass
the containment checks (optimistically).

This comes with a TODO to switch to something like render=lockable to
force containment.


Bug: 882663
Change-Id: I78403b9bd5577a9ff006213c8452f07fb9197f93
Reviewed-on: https://chromium-review.googlesource.com/c/1452473
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629164}
1 file changed