Add VMService GC events

runtime/vm/service/vmservice.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;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:isolate';
 import 'dart:typed_data';
@@ skipping 24 matching lines @@
   }
 
   void _removeClient(Client client) {
     clients.remove(client);
   }
 
   int eventTypeCode(String eventType) {
     switch(eventType) {
       case 'debug':
         return Constants.EVENT_FAMILY_DEBUG;
+      case 'gc':
+        return Constants.EVENT_FAMILY_GC;
       default:
         return -1;
     }
   }
 
   void _updateEventMask() {
     int mask = 0;
     for (var key in eventMap.keys) {
       var subscribers = eventMap[key];
       if (subscribers.isNotEmpty) {
@@ skipping 90 matching lines @@
   return new VMService().eventPort;
 }
 
 void _registerIsolate(int port_id, SendPort sp, String name) {
   var service = new VMService();
   service.runningIsolates.isolateStartup(port_id, sp, name);
 }
 
 void _setEventMask(int mask)
     native "VMService_SetEventMask";