Add FileSystemWatcher class to dart:io.

runtime/bin/socket_patch.dart

 // Copyright (c) 2013, 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.
 
 patch class RawServerSocket {
   /* patch */ static Future<RawServerSocket> bind(address,
                                                   int port,
                                                   {int backlog: 0,
                                                    bool v6Only: false}) {
     return _RawServerSocket.bind(address, port, backlog, v6Only);
@@ skipping 350 matching lines @@
   }
 
   _NativeSocket.listen() : typeFlags = TYPE_LISTENING_SOCKET {
     eventHandlers = new List(EVENT_COUNT + 1);
   }
 
   _NativeSocket.pipe() : typeFlags = TYPE_PIPE {
     eventHandlers = new List(EVENT_COUNT + 1);
   }
 
+  _NativeSocket.watch(int id) : typeFlags = TYPE_NORMAL_SOCKET {
+    eventHandlers = new List(EVENT_COUNT + 1);
+    isClosedWrite = true;
+    nativeSetSocketId(id);
+  }
+
   int available() {
     if (isClosing || isClosed) return 0;
     var result = nativeAvailable();
     if (result is OSError) {
       reportError(result, "Available failed");
       return 0;
     } else {
       return result;
     }
   }
@@ skipping 265 matching lines @@
     // For all errors we close the socket
     close();
   }
 
   bool setOption(SocketOption option, bool enabled) {
     if (option is! SocketOption) throw new ArgumentError(options);
     if (enabled is! bool) throw new ArgumentError(enabled);
     return nativeSetOption(option._value, enabled);
   }
 
+  void nativeSetSocketId(int id) native "Socket_SetSocketId";
   nativeAvailable() native "Socket_Available";
   nativeRead(int len) native "Socket_Read";
   nativeWrite(List<int> buffer, int offset, int bytes)
       native "Socket_WriteList";
   nativeCreateConnect(List<int> addr,
                       int port) native "Socket_CreateConnect";
   nativeCreateBindListen(List<int> addr, int port, int backlog, bool v6Only)
       native "ServerSocket_CreateBindListen";
   nativeAccept(_NativeSocket socket) native "ServerSocket_Accept";
   int nativeGetPort() native "Socket_GetPort";
@@ skipping 551 matching lines @@
     if (_detachReady != null) {
       _detachReady.complete(null);
     } else {
       if (_raw != null) {
         _raw.shutdown(SocketDirection.SEND);
         _disableWriteEvent();
       }
     }
   }
 }