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This CL adds files necessary to start consuming incognito mode APIs from
ARCore. The .aar file mentioned by BUILD.gn is *not* yet uploaded to
CIPD - that will happen once this CL gets all the required approvals.

Change-Id: Ibc408f62aebba003522f381cda0fd526ea66559a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1684493
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676052}