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These functions allow a limited range of domains to be encoded in 22
bits for inclusion in BLE adverts.

BUG=1002262

Change-Id: I122af89cada6e6416d3a647b3ecdc724a8289f47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340063
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#796592}