Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

tests/standalone/vmservice/isolate_stacktrace_command_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_stacktrace_command_test;
-
-import 'test_helper.dart';
-import 'package:expect/expect.dart';
-
-class StacktraceTest extends VmServiceRequestHelper {
-  StacktraceTest(port, id) :
-      super('http://127.0.0.1:$port/$id/stacktrace');
-
-  onRequestCompleted(Map reply) {
-    Expect.equals('StackTrace', reply['type'], 'Not a StackTrace message.');
-    Expect.isTrue(4 <= reply['members'].length, 'Stacktrace is wrong length.');
-    // The number of frames involved in isolate message dispatch is an
-    // implementation detail. Only check that we got all the frames for user
-    // code.
-    Expect.equals('a', reply['members'][0]['function']['name']);
-    Expect.equals('b', reply['members'][1]['function']['name']);
-    Expect.equals('c', reply['members'][2]['function']['name']);
-    Expect.equals('myIsolateName', reply['members'][3]['function']['name']);
-  }
-}
-
-class VMTest extends VmServiceRequestHelper {
-  VMTest(port) : super('http://127.0.0.1:$port/vm');
-
-  String _isolateId;
-  onRequestCompleted(Map reply) {
-    VMTester tester = new VMTester(reply);
-    tester.checkIsolateCount(2);
-    // TODO(turnidge): Fragile.  Relies on isolate order in response.
-    _isolateId = tester.getIsolateId(0);
-  }
-}
-
-
-main() {
-  var process = new TestLauncher('isolate_stacktrace_command_script.dart');
-  process.launch().then((port) {
-    var test = new VMTest(port);
-    test.makeRequest().then((_) {
-      var stacktraceTest = new StacktraceTest(port, test._isolateId);
-      stacktraceTest.makeRequest().then((_) {
-        process.requestExit();
-      });
-    });
-  });
-}