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This CL implements the BluetoothAdvertisingIntervalClient which will set
the advertising interval for Nearby Sharing. It will also handle
restoring the default advertising interval when advertising stops.

Bug: 1119970
Change-Id: Ia4c0febed23dcd751f9e72dace37dd7069b3f33e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466263Reviewed-by: Josh Nohle <nohle@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Michael Hansen <hansenmichael@google.com>
Cr-Commit-Position: refs/heads/master@{#818633}