Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

tests/standalone/vmservice/websocket_client_test.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 unknown_command_test;
-
-import 'test_helper.dart';
-import 'package:expect/expect.dart';
-
-class ClientsRequestTest extends ServiceWebSocketRequestHelper {
-  ClientsRequestTest(port) : super('ws://127.0.0.1:$port/ws');
-  int _count = 0;
-
-  onResponse(var seq, Map response) {
-    if (seq == null) {
-      // Ignore push events.
-      return;
-    }
-    if (seq == 'cli') {
-      // Verify response is correct for 'cli' sequence id.
-      Expect.equals('ClientList', response['type']);
-      Expect.equals(1, response['members'].length);
-      _count++;
-    } else if (seq == 'vm') {
-      // Verify response is correct for 'vm' sequence id.
-      Expect.equals('VM', response['type']);
-      _count++;
-    } else {
-      Expect.fail('Unexpected response from $seq: $response');
-    }
-    if (_count == 2) {
-      // After receiving both responses, the test is complete.
-      complete();
-    }
-  }
-
-  runTest() {
-    // Send a request for clients with 'cli' sequence id.
-    sendMessage('cli', 'clients');
-    // Send a request for vm info with 'vm' sequence id.
-    sendMessage('vm', 'vm');
-  }
-}
-
-main() {
-  var process = new TestLauncher('unknown_command_script.dart');
-  process.launch().then((port) {
-    new ClientsRequestTest(port).connect().then((test) {
-      test.completed.then((_) {
-        process.requestExit();
-      });
-      test.runTest();
-    });
-  });
-}