Provide Network.SignalStrengthChanged signal.

Also, rename signal and method parameters to lower case for
consistency with other DBus services.

BUG=chrome-os-partner:9831
TEST=tested proxy bindings generation in shill

Change-Id: If7c0543cc98bc39fba28e7465bcd6de974d8aa1f
Reviewed-on: https://gerrit.chromium.org/gerrit/23114
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Ready: Darin Petkov <petkov@chromium.org>
3 files changed