Code coverage, something is working now.

pkg/analyzer_experimental/lib/src/services/runtime/coverage/coverage_lib.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.
+
+/// This library is injected into the applications under coverage.
+library coverage_lib;
+
+import "dart:io";
+import 'dart:typed_data';

[pquitslund, 2013/06/17 20:15:58]

I would pick one style of string literal ' vs " and stick with it consistently. 
FWIW: it seems that folks in general are trending towards '.

[scheglov, 2013/06/17 20:50:59]

Done.

+
+const int PORT = 0; // replaced during rewrite
+final Uint8List _executedIds = new Uint8List(1024 * 64);
+
+touch(int id) {
+  int listIndex = id ~/ 8;
+  int bitIndex = id % 8;
+  _executedIds[listIndex] |= 1 << bitIndex;
+}
+
+postStatistics() {
+  HttpClient httpClient = new HttpClient();

[pquitslund, 2013/06/17 20:15:58]

var httpClient

[scheglov, 2013/06/17 20:50:59]

Done.

+  httpClient.post("127.0.0.1", PORT, "/statistics").then((HttpClientRequest request) {
+    request.add(_executedIds);
+    request.close();
+  });
+}