Add a VM page to the observatory.

tests/standalone/vmservice/isolate_class_test.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.
 
 library isolate_class_test;
 
 import 'dart:async';
 import 'test_helper.dart';
 import 'package:expect/expect.dart';
 
@@ skipping 29 matching lines @@
       super('http://127.0.0.1:$port/$id/');
 
   String _libId;
   onRequestCompleted(Map reply) {
     Expect.equals('Isolate', reply['type']);
     Expect.equals('isolate_stacktrace_command_script', reply['rootLib']['name']);
     _libId = reply['rootLib']['id'];
   }
 }
 
-class IsolateListTest extends VmServiceRequestHelper {
-  IsolateListTest(port) : super('http://127.0.0.1:$port/isolates');
+class VMTest extends VmServiceRequestHelper {
+  VMTest(port) : super('http://127.0.0.1:$port/vm');
 
   String _isolateId;
   onRequestCompleted(Map reply) {
-    IsolateListTester tester = new IsolateListTester(reply);
+    VMTester tester = new VMTester(reply);
     tester.checkIsolateCount(2);
     // TODO(turnidge): Fragile.  Relies on isolate order in response.
     _isolateId = tester.getIsolateId(1);
   }
 }
 
 main() {
   var process = new TestLauncher('isolate_stacktrace_command_script.dart');
   process.launch().then((port) {
-    var test = new IsolateListTest(port);
+    var test = new VMTest(port);
     test.makeRequest().then((_) {
       var isolateSummaryTest =
           new IsolateSummaryTest(port, test._isolateId);
       isolateSummaryTest.makeRequest().then((_) {
         var libraryTest = new LibraryTest(port, test._isolateId,
                                           isolateSummaryTest._libId);
         libraryTest.makeRequest().then((_) {
           var classTest = new ClassTest(port, test._isolateId,
                                         libraryTest._classId);
           classTest.makeRequest().then((_) {
             process.requestExit();
           });
         });
       });
     });
   });
 }