Add a hash code to client and server web socket connections

runtime/bin/websocket.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * The web socket protocol is implemented by a HTTP server handler
  * which can be instantiated like this:
  *
  *     WebSocketHandler wsHandler = new WebSocketHandler();
  *
@@ skipping 18 matching lines @@
    * Sets the callback to be called when a new web socket connection
    * has been established.
    */
   void set onOpen(callback(WebSocketConnection connection));
 }
 
 
 /**
  * Server web socket connection.
  */
-interface WebSocketConnection {
+interface WebSocketConnection extends Hashable {
   /**
    * Sets the callback to be called when a message have been
    * received. The type on [message] is either [:String:] or
    * [:List<int>:] depending on whether it is a text or binary
    * message. If the message is empty [message] will be [:null:].
    */
   void set onMessage(void callback(message));
 
   /**
    * Sets the callback to be called when the web socket connection is
@@ skipping 11 matching lines @@
    * Sends a message. The [message] must be a [:String:] a
    * [:List<int>:] or [:null:].
    */
   send(Object message);
 
   /**
    * Close the web socket connection. The default value for [status]
    * and [reason] are [:null:].
    */
   close([int status, String reason]);
+
+  /**
+   * WebSocketConnection is hashable.
+   */
+  int hashCode();
 }
 
 
 /**
  * Client web socket connection.
  */
-interface WebSocketClientConnection default _WebSocketClientConnection {
+interface WebSocketClientConnection
+    extends Hashable default _WebSocketClientConnection {
   /**
    * Creates a new web socket client connection based on a HTTP client
    * connection. The HTTP client connection must be freshly opened.
    */
   WebSocketClientConnection(HttpClientConnection conn,
                             [List<String> protocols]);
 
   /**
    * Sets the callback to be called when the request object for the
    * opening handshake request is ready. This callback can be used if
@@ skipping 43 matching lines @@
    * [:List<int>:]. To send an empty message use either an empty
    * [:String:] or an empty [:List<int>:]. [:null:] cannot be used.
    */
   send(message);
 
   /**
    * Close the web socket connection. The default value for [status]
    * and [reason] are [:null:].
    */
   close([int status, String reason]);
+
+  /**
+   * WebSocketClientConnection is hashable.
+   */
+  int hashCode();
 }
 
 
 /**
  * Base interface for the events generated by the W3C complient
  * browser API for web sockets.
  */
 interface Event { }
 
 /**
@@ skipping 114 matching lines @@
    */
   void send(data);
 }
 
 
 class WebSocketException implements Exception {
   const WebSocketException([String this.message = ""]);
   String toString() => "WebSocketException: $message";
   final String message;
 }