Adds NetworkConnect::ConnectToNetworkId(), uses it in detailed VPN page

chromeos/network/network_connect_unittest.cc

Index: chromeos/network/network_connect_unittest.cc
diff --git a/chromeos/network/network_connect_unittest.cc b/chromeos/network/network_connect_unittest.cc
index 0a3cd441a8e5da5ce2d5b9d8d5225a146ccb6c48..90d2444d7734f7479761fd54b021faf842b1e9ce 100644
--- a/chromeos/network/network_connect_unittest.cc
+++ b/chromeos/network/network_connect_unittest.cc
@@ -16,6 +16,7 @@
 #include "chromeos/network/network_connect.h"
 #include "chromeos/network/network_connection_handler.h"
 #include "chromeos/network/network_handler.h"
+#include "chromeos/network/network_state.h"
 #include "chromeos/network/network_state_handler.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -223,6 +224,21 @@ TEST_F(NetworkConnectTest,
       kWiFi1Guid, NetworkConnectionHandler::kErrorCertificateRequired);
 }
 
+TEST_F(NetworkConnectTest, ConnectThenDisconnectWiFiNetwork) {
+  const NetworkState* network =
+      NetworkHandler::Get()->network_state_handler()->GetNetworkStateFromGuid(
+          kWiFi1Guid);
+
+  NetworkConnect::Get()->ConnectToNetworkId(kWiFi1Guid);
+  base::RunLoop().RunUntilIdle();
+  EXPECT_TRUE(network->IsConnectedState());
+
+  NetworkConnect::Get()->DisconnectFromNetworkId(kWiFi1Guid);
+  base::RunLoop().RunUntilIdle();
+  EXPECT_FALSE(network->IsConnectedState());
+  EXPECT_FALSE(network->IsConnectingState());
+}
+
 // ShowNetworkSettings only applies to cellular networks.
 TEST_F(NetworkConnectTest, ShowNetworkSettings) {
   EXPECT_CALL(*mock_delegate_, ShowNetworkSettings(kCellular1Guid));