Retaining path improvements.

runtime/observatory/tests/service/get_retaining_path_rpc_test.dart

 // Copyright (c) 2015, 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.
 // VMOptions=--compile_all --error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 
 import 'test_helper.dart';
 
@@ skipping 60 matching lines @@
 
   (Isolate isolate) async {
     var target1 = await eval(
         isolate, '() { var tmp = target1; target1 = null; return tmp;} ()');
     var params = {
       'targetId': target1['id'],
       'limit': 4,
     };
     var result = await isolate.invokeRpcNoUpgrade('_getRetainingPath', params);
     expect(result['type'], equals('RetainingPath'));
-    expect(result['elements'][0]['parentField']['name'], equals('x'));
+    expect(result['elements'][1]['parentField']['name'], equals('x'));
     expect(result['elements'][2]['value']['name'], equals('globalObject'));
   },
 
   (Isolate isolate) async {
     var target2 = await eval(
         isolate, '() { var tmp = target2; target2 = null; return tmp;} ()');
     var params = {
       'targetId': target2['id'],
       'limit': 4,
     };
     var result = await isolate.invokeRpcNoUpgrade('_getRetainingPath', params);
     expect(result['type'], equals('RetainingPath'));
-    expect(result['elements'][0]['parentField']['name'], equals('y'));
+    expect(result['elements'][1]['parentField']['name'], equals('y'));
     expect(result['elements'][2]['value']['name'], equals('globalObject'));
   },
 
   (Isolate isolate) async {
     var target3 = await eval(
         isolate, '() { var tmp = target3; target3 = null; return tmp;} ()');
     var params = {
       'targetId': target3['id'],
       'limit': 4,
     };
     var result = await isolate.invokeRpcNoUpgrade('_getRetainingPath', params);
     expect(result['type'], equals('RetainingPath'));
-    expect(result['elements'][0]['parentListIndex'], equals(12));
+    expect(result['elements'][1]['parentListIndex'], equals(12));
     expect(result['elements'][2]['value']['name'], equals('globalList'));
   },
 ];
 
 main(args) async => runIsolateTests(args, tests, testeeBefore:warmup);