Enable oopif printing for site isolation

Properly gate oopif printing for site isolation flag or feature, or
top document isolation. Previously we missed site isolation feature.

BUG=455764

Change-Id: I05a1b373c6186c29f22210bfa2013302f3664c79
Reviewed-on: https://chromium-review.googlesource.com/898504
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539323}
1 file changed