shill: Support Cellular CDMA activation.

Still TODO is communicating the activation error codes to the Cellular service.
... And, of course, asynchronous calls throughout.

BUG=chromium-os:19305
TEST=unit tests

Change-Id: I3e0b4a5a8d3c4c74db35ce7f74b5d958677d8b66
Reviewed-on: http://gerrit.chromium.org/gerrit/6192
Tested-by: Darin Petkov <petkov@chromium.org>
Reviewed-by: Chris Masone <cmasone@chromium.org>
diff --git a/modem_cdma_proxy.cc b/modem_cdma_proxy.cc
index 4628fb8..4a92f88 100644
--- a/modem_cdma_proxy.cc
+++ b/modem_cdma_proxy.cc
@@ -18,6 +18,10 @@
 
 ModemCDMAProxy::~ModemCDMAProxy() {}
 
+uint32 ModemCDMAProxy::Activate(const string &carrier) {
+  return proxy_.Activate(carrier);
+}
+
 void ModemCDMAProxy::GetRegistrationState(uint32 *cdma_1x_state,
                                           uint32 *evdo_state) {
   proxy_.GetRegistrationState(*cdma_1x_state, *evdo_state);