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Propagate the "is_xr_overlay" fullscreen request type flag for OOPIF
requests via mojo, and ensure that visibility is set correctly for
out of process container iframe elements.

Note for testing: Currently, Chrome on Android only enforces site
isolation for sites with login active, and not on low memory devices.
Run with the --site-per-process command line flag to override this.

Bug: 1101193
Change-Id: Ic8736e90f28fbda2d6cb1f665cbd0804c3f38cc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283968
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798382}