Refactor service tests in preparation of running on sky_shell

runtime/observatory/tests/service/vm_restart_test.dart

 // Copyright (c) 2015, 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.
 // VMOptions=--compile-all --error_on_bad_type --error_on_bad_override
 
 import 'dart:async';
 import 'dart:developer';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
+import 'service_test_common.dart';
 import 'test_helper.dart';
 
 int count = 0;
 
 void test() {
   while (true) {
     count++;
     debugger();
   }
 }
@@ skipping 42 matching lines @@
             newIsolate.rootLibrary.evaluate('count').then((result) {
               expect(result.type, equals('Instance'));
               expect(result.valueAsString, equals('1'));
               debugSub.cancel();
               testCompleter.complete();
             });
           });
         }
       }
     });
-    
+
     Completer restartCompleter = new Completer();
     var isolateStream = await isolate.vm.getEventStream(VM.kIsolateStream);
     var isolateSub;
     bool exit = false;
     bool start = false;
     isolateSub = isolateStream.listen((ServiceEvent event) {
       if (event.kind == ServiceEvent.kIsolateExit) {
         expect(event.isolate, equals(isolate));
         print('Old isolate exited');
         exit = true;
@@ skipping 11 matching lines @@
 
     // Restart the vm.
     print("restarting");
     await isolate.vm.restart();
     await restartCompleter.future;
     print("restarted");
     await testCompleter.future;
   },
 ];
 
-  
+
 main(args) => runIsolateTests(args, tests, testeeConcurrent: test);