Disable IPv6 lookup by default.

runtime/bin/socket_patch.dart

Index: runtime/bin/socket_patch.dart
diff --git a/runtime/bin/socket_patch.dart b/runtime/bin/socket_patch.dart
index 58c9ddd0547f12a6942202b8a03a54bc5f699535..daa59c6448fc629f34fc8e14f99d17e80099c26a 100644
--- a/runtime/bin/socket_patch.dart
+++ b/runtime/bin/socket_patch.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 patch class RawServerSocket  {
-  /* patch */ static Future<RawServerSocket> bind([String address = "127.0.0.1",
+  /* patch */ static Future<RawServerSocket> bind([address = "127.0.0.1",
                                                    int port = 0,
                                                    int backlog = 0]) {
     return _RawServerSocket.bind(address, port, backlog);
@@ -20,7 +20,7 @@ patch class RawSocket {
 
 patch class InternetAddress {
   /* patch */ static Future<List<InternetAddress>> lookup(
-      String host, {InternetAddressType type: InternetAddressType.ANY}) {
+      String host, {InternetAddressType type: InternetAddressType.IPv4}) {
     return _NativeSocket.lookup(host, type: type);
   }
 }
@@ -105,7 +105,7 @@ class _NativeSocket extends NativeFieldWrapperClass1 {
   static SendPort socketService;
 
   static Future<List<InternetAddress>> lookup(
-      String host, {InternetAddressType type: InternetAddressType.ANY}) {
+      String host, {InternetAddressType type: InternetAddressType.IPv4}) {
     ensureSocketService();
     return socketService.call([HOST_NAME_LOOKUP, host, type._value])
         .then((response) {
@@ -160,15 +160,19 @@ class _NativeSocket extends NativeFieldWrapperClass1 {
         });
   }
 
-  static Future<_NativeSocket> bind(String address,
+  static Future<_NativeSocket> bind(host,
                                     int port,
                                     int backlog) {
-    return lookup(address)
-        .then((list) {
-          if (list.length == 0) {
-            throw createError(response, "Failed host name lookup");
-          }
-          return list[0];
+    return new Future.value(host)
+        .then((host) {
+          if (host is _InternetAddress) return host;
+          return lookup(host)
+              .then((list) {
+                if (list.length == 0) {
+                  throw createError(response, "Failed host name lookup");
+                }
+                return list[0];
+              });
         })
         .then((address) {
           var socket = new _NativeSocket.listen();
@@ -486,7 +490,7 @@ class _RawServerSocket extends Stream<RawSocket>
   final _NativeSocket _socket;
   StreamController<RawSocket> _controller;
 
-  static Future<_RawServerSocket> bind(String address,
+  static Future<_RawServerSocket> bind(address,
                                        int port,
                                        int backlog) {
     if (port < 0 || port > 0xFFFF)
@@ -680,7 +684,7 @@ class _RawSocket extends Stream<RawSocketEvent>
 
 
 patch class ServerSocket {
-  /* patch */ static Future<ServerSocket> bind([String address = "127.0.0.1",
+  /* patch */ static Future<ServerSocket> bind([address = "127.0.0.1",
                                                 int port = 0,
                                                 int backlog = 0]) {
     return _ServerSocket.bind(address, port, backlog);
@@ -691,7 +695,7 @@ class _ServerSocket extends Stream<Socket>
                     implements ServerSocket {
   final _socket;
 
-  static Future<_ServerSocket> bind(String address,
+  static Future<_ServerSocket> bind(address,
                                     int port,
                                     int backlog) {
     return _RawServerSocket.bind(address, port, backlog)