Implement 'print', 'up', 'down', and 'frame' commands in the Observatory debugger.

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;
 
 /// A [ServiceObject] represents a persistent object within the vm.
 abstract class ServiceObject extends Observable {
   static int LexicalSortName(ServiceObject o1, ServiceObject o2) {
     return o1.name.compareTo(o2.name);
@@ skipping 1189 matching lines @@
 
   Future<ServiceObject> eval(ServiceObject target,
                              String expression) {
     Map params = {
       'targetId': target.id,
       'expression': expression,
     };
     return invokeRpc('eval', params);
   }
 
+  Future<ServiceObject> evalFrame(int framePos,
+                                  String expression) {
+    Map params = {
+      'frame': framePos,
+      'expression': expression,
+    };
+    return invokeRpc('evalFrame', params);
+  }
+
   Future<ServiceObject> getRetainedSize(ServiceObject target) {
     Map params = {
       'targetId': target.id,
     };
     return invokeRpc('getRetainedSize', params);
   }
 
   Future<ServiceObject> getRetainingPath(ServiceObject target, var limit) {
     Map params = {
       'targetId': target.id,
@@ skipping 1675 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);
     }
   }
 }