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Can you add a reference to the API proposal in the description.

Done.

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

ℹ️ Googlers: Go here for more info.

Looks like this was almost over the line before the holidays hit. Hope this comment may bring it back on someone's radar. Thanks.

Thanks for the reminder. I'll get this in front of the appropriate people this week, and we'll see if we can finish it up. (It had stalled due to some internal launch processes, but those were cleared up just before the holidays.)