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When requesting a session and after the camera permission is confirmed
to have been granted, check if ARCore is installed and if the version
used in Chromium is compatible with it. If ARCore is not installed
or an update is required, a prompt will be shown.

Bug: 838954
Change-Id: I35ae39041e7958743bba9cc1c71f5af817bf4240
Reviewed-on: https://chromium-review.googlesource.com/1074494Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Iker Jamardo <ijamardo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566589}