Add a VM page to the observatory.

tests/standalone/vmservice/isolate_echo_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_echo_test;
 
 import 'test_helper.dart';
 import 'package:expect/expect.dart';
 
 class EchoRequestTest extends VmServiceRequestHelper {
@@ skipping 15 matching lines @@
     Expect.equals('z', reply['request']['option_keys'][3]);
 
     Expect.equals(4, reply['request']['option_values'].length);
     Expect.equals('b', reply['request']['option_values'][0]);
     Expect.equals('', reply['request']['option_values'][1]);
     Expect.equals('e', reply['request']['option_values'][2]);
     Expect.equals('w', reply['request']['option_values'][3]);
   }
 }
 
-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(1);
     _isolateId = tester.getIsolateId(0);
   }
 }
 
 
 main() {
   var process = new TestLauncher('isolate_echo_script.dart');
   process.launch().then((port) {
-    var test = new IsolateListTest(port);
+    var test = new VMTest(port);
     test.makeRequest().then((_) {
       var echoRequestTest = new EchoRequestTest(port, test._isolateId);
       echoRequestTest.makeRequest().then((_) {
         process.requestExit();
       });
     });
   });
 }