Add new InternetAddress class with a static lookup function (including IPv6

sdk/lib/_internal/compiler/implementation/lib/io_patch.dart

Index: sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
index 9b38456697fd36b92e032d7267180fa1992c847b..af05ad03d305e8d33f73b6fd39db83e873a9da11 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
@@ -190,6 +190,13 @@ patch class Process {
   }
 }
 
+patch class InternetAddress {
+  patch static Future<List<InternetAddress>> lookup(
+      String host, {InternetAddressType type: InternetAddressType.ANY}) {
+    throw new UnsupportedError("InternetAddress.lookup");
+  }
+}
+
 patch class RawServerSocket {
   patch static Future<RawServerSocket> bind([String address = "127.0.0.1",
                                              int port = 0,