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The attributes were defaulting to optional, leading to invalid access.
Mark as required in IDL and add an additional check to enforce a
positive number for widthInMeters.

Bug: 1151619
Change-Id: Ib2353478f93330d76072b9bfc69bc189bc5523aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2556918
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830693}