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Changes:
- Roll ARCore SDK to version 1.18.
- Updated device implementation to opt in to use 30FPS.
- Updated ARCore APK version to 1.18.200603086 for the test bots to use.
- Updated ARCore session recording - now that the code opts in to use
30FPS, the recordings need to be done at 30FPS as well, otherwise the
camera configuration will fail.

~3kb since it needs to consume newly introduced APIs to configure AR
session. The remaining size increase can be mostly attributed to the
dependency growing (+8kb) and overhead (~4kb) - see breakdown for
details.

Binary-Size: Size increase is unavoidable. The product code increased by
Change-Id: Ied48a1d4e6203e697ff5489547f7e9a67be6af0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300808
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789689}