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These session behave identically to the previous sample ("Magic Window")
with the exception that you cannot enter VR, and there are multiple
sessions instead of a single one.

Change-Id: Ic26649a5576cba3643ff903fc0c12fccbfe2afd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835267Reviewed-by: Jacob DeWitt <jacde@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Will Cassella <cassew@google.com>
Cr-Commit-Position: refs/heads/master@{#702626}