Add support for passkey authentication in Bluetooth pairing

Enables Bluetooth pairing to receive a passkey from the
remote input device, and then show it onscreen, allowing the
user to type it to complete the pairing process.

BUG=none
TEST=manual

Change-Id: I73688746c0697ac8c6a0fbaf941b8d975154992a
Reviewed-on: https://chromium-review.googlesource.com/266261
Reviewed-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Peter Ammon <pca@chromium.org>
Tested-by: Peter Ammon <pca@chromium.org>
1 file changed