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This mirrors the same APIs on Receiver, that should also exist for
associated interfaces.

Change-Id: Ie2feef11f86b2597a8b431b2bbbbb8110b54b0f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461981
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#816266}