Support open urls and other operations in multiple windows

The counterpart CL in downstream is
https://chrome-internal-review.googlesource.com/c/chrome/ios_internal/+/3180818

Bug: 1085419
Change-Id: I3e20df0bb93d47009cdaa30896c52c8c648b05a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315432


Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791487}