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Used by AudioInputStreamBroker (introduced in dependent CL) instead of
AudioInputDeviceManager::KeyboardMicRegistration implementation, in order to avoid thread jumps and
to keep broker interface simple.

AudioInputDeviceManager::KeyboardMicRegistration will be removed after switching to audio service
input streams.

Bug: 828868
Change-Id: I41aac3e01faeb0d4d47f98726bc069640fb346e3
Reviewed-on: https://chromium-review.googlesource.com/1044216
Commit-Queue: Marina Ciocea <marinaciocea@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556390}