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WebXR depth API: add soon-to-be-required methods to ARCore shim

In addition, alphabetize few outlier methods to make it consistent
with the rest of the code here.

Change-Id: Iefdd9657e4507f393ee1c2e60dcde33012f2a592
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363218
Auto-Submit: Piotr Bialecki <bialpio@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799941}