[CrOS Tether] Add HasConnectedToHost property for Tether networks.

chromeos/network/network_state.cc

Index: chromeos/network/network_state.cc
diff --git a/chromeos/network/network_state.cc b/chromeos/network/network_state.cc
index 838faa0b3b8f1dfc9b6f01f6b71c7dc904403343..3ea195db3fd90593d5ff1c46775d74f370baf7f6 100644
--- a/chromeos/network/network_state.cc
+++ b/chromeos/network/network_state.cc
@@ -267,6 +267,8 @@ void NetworkState::GetStateProperties(base::DictionaryValue* dictionary) const {
     dictionary->SetIntegerWithoutPathExpansion(kTetherBatteryPercentage,
                                                battery_percentage());
     dictionary->SetStringWithoutPathExpansion(kTetherCarrier, carrier());
+    dictionary->SetBooleanWithoutPathExpansion(
+        kTetherHasConnectedToHost, has_connected_as_tether_client());
     dictionary->SetIntegerWithoutPathExpansion(kTetherSignalStrength,
                                                signal_strength());
   }