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This will control whether we document a Promise-ified version of an API.
(Chrome's implementation CPP already pierces into the JSON directly to answer the support Q.)

Bug: 1142991
Bug: 1143020
Change-Id: I1a3c29c7d1c21cc52b55b88db12478e4b1e14811
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569130Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Sam Thorogood <thorogood@google.com>
Cr-Commit-Position: refs/heads/master@{#843249}