Open a firewall hole when a TCP server or UDP socket is bound.

chromeos/chromeos_switches.cc

Index: chromeos/chromeos_switches.cc
diff --git a/chromeos/chromeos_switches.cc b/chromeos/chromeos_switches.cc
index 93d12923de7fb9de80cd2a04f907b6b0ea06d9d8..31b01dfed0a3d97680ddb1b080151eb375da23c7 100644
--- a/chromeos/chromeos_switches.cc
+++ b/chromeos/chromeos_switches.cc
@@ -332,6 +332,9 @@ const char kDisableTimeZoneTrackingOption[] =
 // Disable new GAIA sign-in flow.
 const char kDisableWebviewSigninFlow[] = "disable-webview-signin-flow";
 
+// Enable Chrome OS firewall hole-punching for Chrome Apps.
+const char kEnableFirewallHolePunching[] = "enable-firewall-hole-punching";
+
 bool WakeOnWifiEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(kDisableWakeOnWifi);
 }