Add .address to [Raw]ServerSocket and HttpServer.

sdk/lib/io/socket.dart

Index: sdk/lib/io/socket.dart
diff --git a/sdk/lib/io/socket.dart b/sdk/lib/io/socket.dart
index c5b4b8d005093ffeb04bb8aeb52b40d0f41058d8..ce8ace5476635829bccca0e2998141e430cfa8bf 100644
--- a/sdk/lib/io/socket.dart
+++ b/sdk/lib/io/socket.dart
@@ -202,6 +202,11 @@ abstract class RawServerSocket implements Stream<RawSocket> {
   int get port;
 
   /**
+   * Returns the address used by this socket.
+   */
+  InternetAddress get address;
+
+  /**
    * Closes the socket. The returned future completes when the socket
    * is fully closed and is no longer bound.
    */
@@ -258,6 +263,11 @@ abstract class ServerSocket implements Stream<Socket> {
   int get port;
 
   /**
+   * Returns the address used by this socket.
+   */
+  InternetAddress get address;
+
+  /**
    * Closes the socket. The returned future completes when the socket
    * is fully closed and is no longer bound.
    */