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This improves our alignment with the current draft spec, and exposes
the APIs required to implement planar access.

Bug: 1096717, 1096722, 897297
Change-Id: Ic9f33ce703e4492d61ad5784c849b8816a75b89f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341836Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796522}