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

tests/standalone/vmservice/isolate_stacktrace_command_script.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_script;
-
-import 'dart:io';
-import 'dart:isolate';
-
-void a() {
-  int x = 0;
-  print(''); // Print blank line to signal that we are ready.
-  while (true) {
-    x &= x;
-  }
-}
-
-void b() {
-  a();
-}
-
-class C {
-  c() {
-    b();
-  }
-}
-
-void myIsolateName(_) {
-  new C().c();
-}
-
-main() {
-  Isolate.spawn(myIsolateName, null);
-  // Wait until signaled from spawning test.
-  stdin.first.then((_) => exit(0));
-}