shill: Transition Cellular's state to Registered when the modem is registered.

Also, process GSM network technology types and roaming states and update the
Cellular service appropriately.

BUG=chromium-os:19676
TEST=unit tests, tested on device

Change-Id: I6606a01a07cf635cb344aef95c3145eaf2290fba
Reviewed-on: http://gerrit.chromium.org/gerrit/6768
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/mock_modem_gsm_network_proxy.h b/mock_modem_gsm_network_proxy.h
index 633f25f..ebf6bd6 100644
--- a/mock_modem_gsm_network_proxy.h
+++ b/mock_modem_gsm_network_proxy.h
@@ -18,6 +18,8 @@
   virtual ~MockModemGSMNetworkProxy();
 
   MOCK_METHOD1(Register, void(const std::string &network_id));
+  MOCK_METHOD0(GetRegistrationInfo, RegistrationInfo());
+  MOCK_METHOD0(AccessTechnology, uint32());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockModemGSMNetworkProxy);