GitLab

When we try to open a singleton tab from a tab-less window (can't open
new tabs), it won't search for that singleton in the window that it
eventually opens the tab in, and thus could open a second copy in that
window. This CL causes it to first search more broadly for singletons
from tab-less windows. This should cause it to find the singleton in
that situation.

Bug: 939388
Change-Id: I96ff82925382e1db545b078b17cade11998711c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837972
Commit-Queue: Kevin Bailey <krb@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702650}