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This lowers the interval for Fast Initiation advertising, and then
restores it to a reasonable default when advertising stops.

See design document: go/nearby-chrome-bt.

Bug: b:154846208
Change-Id: I02720b0ee50ee2bd48f62c010d8da10b8aa6ed2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264623Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Cr-Commit-Position: refs/heads/master@{#784516}