Support stacktrace and objecthistogram service commands

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 multiple_isolate_list_script;
+library isolate_stacktrace_command_script;
 
 import 'dart:io';
 import 'dart:isolate';
 
-void isolateMain1() {
-  // Die immediately.
-  port.close();
+void a() {
+  int x = 0;
+  while (true) {
+    x &= x;
+  }
+}
+
+void b() {
+  a();
+}
+
+class C {
+  c() {
+    b();
+  }
 }
 
 void myIsolateName() {
-  // Stay running.
-  port.receive((a, b) {
-    port.close();
-  });
+  new C().c();
 }
 
 main() {
-  spawnFunction(isolateMain1);
   spawnFunction(myIsolateName);
   print(''); // Print blank line to signal that we are ready.
   // Wait until signaled from spawning test.
   stdin.first.then((_) => exit(0));
 }