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This CL plumbs the address change event to the Web UI dialog,
so that it can listen all the necessary events even after the
address has changed, and take appropriate response (like
automatically closing the dialog after the pairing is established.).

BUG=1045310
TEST=ARC++ CTSVerifer BLE Secure Client test (see the bug for the detail)

Change-Id: I023404adf561d6da2ac1148470a15b9e57b8ea1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016775Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kazuhiro Inaba <kinaba@chromium.org>
Auto-Submit: Kazuhiro Inaba <kinaba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738753}