Add handling for plane detection data in blink

This change will add blink changes to handle returning plane detection
data that will eventually be received from ARCore.

Bug: 957129
Change-Id: I716728679003313497372428fd40ecdcd3df8de8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585118
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656520}