DevFS initial implementation

runtime/observatory/lib/src/service/object.dart

 // Copyright (c) 2014, 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.
 
 part of service;
 
 // Some value smaller than the object ring, so requesting a large array
 // doesn't result in an expired ref because the elements lapped it in the
 // object ring.
 const int kDefaultFieldLimit = 100;
@@ skipping 24 matching lines @@
   static const kInvalidRequest = -32600;
   static const kMethodNotFound = -32601;
   static const kInvalidParams  = -32602;
   static const kInternalError  = -32603;
   static const kFeatureDisabled         = 100;
   static const kCannotAddBreakpoint     = 102;
   static const kStreamAlreadySubscribed = 103;
   static const kStreamNotSubscribed     = 104;
   static const kIsolateMustBeRunnable   = 105;
   static const kIsolateMustBePaused     = 106;
-  static const kIsolateIsReloading      = 107;
+  static const kIsolateIsReloading      = 1000;
+  static const kFileSystemAlreadyExists = 1001;
+  static const kFileSystemDoesNotExist  = 1002;
+  static const kFileDoesNotExist        = 1003;
 
   int code;
   Map data;
 
   static _getMessage(Map errorMap) {
     Map data = errorMap['data'];
     if (data != null && data['details'] != null) {
       return data['details'];
     } else {
       return errorMap['message'];
@@ skipping 4055 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }