Add a VM page to the observatory.

tests/standalone/vmservice/isolate_class_field_test.dart

Index: tests/standalone/vmservice/isolate_class_field_test.dart
diff --git a/tests/standalone/vmservice/isolate_class_field_test.dart b/tests/standalone/vmservice/isolate_class_field_test.dart
index 737f41a50227fcaa26b02907b9d5e44cfc43efa7..be85613884fa63ecebf403432727e3d6f0fe4017 100644
--- a/tests/standalone/vmservice/isolate_class_field_test.dart
+++ b/tests/standalone/vmservice/isolate_class_field_test.dart
@@ -154,12 +154,12 @@ class ClassTableTest extends VmServiceRequestHelper {
   }
 }
 
-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);
   }
@@ -168,7 +168,7 @@ class IsolateListTest extends VmServiceRequestHelper {
 main() {
   var process = new TestLauncher('field_script.dart');
   process.launch().then((port) {
-    var test = new IsolateListTest(port);
+    var test = new VMTest(port);
     test.makeRequest().then((_) {
       var classTableTest = new ClassTableTest(port, test._isolateId);
       classTableTest.makeRequest().then((_) {