Support stacktrace and objecthistogram service commands

tests/standalone/vmservice/test_helper.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 vmservice_test_helper;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as JSON;
 import 'dart:utf' as UTF;
@@ skipping 69 matching lines @@
     var dartScript = Platform.script;
     var splitPoint = dartScript.lastIndexOf(Platform.pathSeparator);
     var scriptDirectory = dartScript.substring(0, splitPoint);
     return scriptDirectory + Platform.pathSeparator + script;
   }
 
   Future<int> launch() {
     String dartExecutable = Platform.executable;
     return Process.start(dartExecutable,
                          ['--enable-vm-service:0', scriptPath]).then((p) {
+
       Completer completer = new Completer();
       process = p;
       var portNumber;
       var blank;
       var first = true;
       process.stdout.transform(new StringDecoder())
                     .transform(new LineTransformer()).listen((line) {
         if (line.startsWith('VmService listening on port ')) {
           RegExp portExp = new RegExp(r"\d+");
           var port = portExp.stringMatch(line);
           portNumber = int.parse(port);
         }
         if (line == '') {
           // Received blank line.
           blank = true;
         }
         if (portNumber != null && blank == true && first == true) {
           completer.complete(portNumber);
           // Stop repeat completions.
           first = false;
         }
       });
       process.stderr.transform(new StringDecoder())
                     .transform(new LineTransformer()).listen((line) {
       });
-      process.exitCode.then((_) { });
+      process.exitCode.then((code) {
+        Expect.equals(0, code, 'Launched dart executable exited with error.');
+      });
       return completer.future;
     });
   }
 
   void requestExit() {
-    process.stdin.add([32]);
+    process.stdin.add([32, 13, 10]);
   }
 }
 
 class IsolateListTester {
   final Map isolateList;
 
   IsolateListTester(this.isolateList) {
     // The reply is an IsolateList.
     Expect.equals('IsolateList', isolateList['type'], 'Not an IsolateList.');
   }
 
   void checkIsolateCount(int n) {
     Expect.equals(n, isolateList['members'].length, 'Isolate count not $n');
   }
 
   void checkIsolateIdExists(int id) {
     var exists = false;
     isolateList['members'].forEach((isolate) {
       if (isolate['id'] == id) {
         exists = true;
       }
     });
     Expect.isTrue(exists, 'No isolate with id: $id');
   }
 
-  void checkIsolateNameContains(String name) {
+  int checkIsolateNameContains(String name) {
     var exists = false;
+    int id;
     isolateList['members'].forEach((isolate) {
       if (isolate['name'].contains(name)) {
         exists = true;
+        id = isolate['id'];
       }
     });
     Expect.isTrue(exists, 'No isolate with name: $name');
+    return id;
   }
 
   void checkIsolateNamePrefix(int id, String name) {
     var exists = false;
     isolateList['members'].forEach((isolate) {
       if (isolate['id'] == id) {
         exists = true;
         Expect.isTrue(isolate['name'].startsWith(name),
                       'Isolate $id does not have name prefix: $name'
                       ' (was ${isolate['name']})');
       }
     });
     Expect.isTrue(exists, 'No isolate with id: $id');
   }
 }