Add .address to [Raw]ServerSocket and HttpServer.

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 0042aed1eb3a977afcdc850596ecb3721fe50748..7a4694b428eac52728a8574d64ca94200653e81c 100644
--- a/runtime/bin/socket_patch.dart
+++ b/runtime/bin/socket_patch.dart
@@ -711,6 +711,8 @@ class _RawServerSocket extends Stream<RawSocket>
 
   int get port => _socket.port;
 
+  InternetAddress get address => _socket.address;
+
   Future close() => _socket.close().then((_) => this);
 
   void _pause() {
@@ -921,6 +923,8 @@ class _ServerSocket extends Stream<Socket>
 
   int get port => _socket.port;
 
+  InternetAddress get address => _socket.address;
+
   Future close() => _socket.close().then((_) => this);
 }