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This adds a mechanism to rotate the Nearby Connections advertisement
and Bluetooth MAC address every [12, 15) minutes. This is to protect
user privacy by preventing tracking using this data.

Spec: go/nearby-chrome-bt

Bug: b:154846485
Change-Id: I841aa103fb374a4812ab928bc862af026835a03c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419692
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809928}