Add Isolate.kill().

tests/isolate/ping_test.dart

 // Copyright (c) 2014, 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.
 
 import "dart:isolate";
 import "dart:async";
 import "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
 
 isomain1(replyPort) {
@@ skipping 30 matching lines @@
       };
       echoPort.send(4);
       SendPort createPingPort(message) {
         var pingPort = new RawReceivePort();
         pingPort.handler = (_) {
           result.add(message);
           pingPort.close();
         };
         return pingPort.sendPort;
       }
-      isolate.ping(createPingPort("alive"), Isolate.PING_ALIVE);
+      isolate.ping(createPingPort("alive"), Isolate.OUT_OF_BAND);
       echoPort.send(3);
-      isolate.ping(createPingPort("control"), Isolate.PING_CONTROL);
+      isolate.ping(createPingPort("control"), Isolate.BEFORE_NEXT_EVENT);
       echoPort.send(2);
-      isolate.ping(createPingPort("event"), Isolate.PING_EVENT);
+      isolate.ping(createPingPort("event"), Isolate.AS_EVENT);
       echoPort.send(1);
       echoPort.send(0);
     });
   });
 }