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Includes tweaks to ClientProxy subclasses and the tests that
use them, because ClientProxy::OnBandwidthChanged() signature
changed.

Includes tweaks to BleMedium implementation to account
for addition of Fast Advertisement feature, but does not
correctly implement their expectations -- that will be
done in a subsequent CL.

Change-Id: I71fb3f8314abc3439350096243f544cc63e79c02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410652
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#807648}