- Add dart:json, dart:uri and dart:utf8 to the known and builtin libraries.

bin/uri_sources.gypi

Index: bin/uri_sources.gypi
===================================================================
--- bin/uri_sources.gypi	(revision 0)
+++ bin/uri_sources.gypi	(revision 0)
@@ -0,0 +1,10 @@
+# Copyright (c) 2012, 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 file contains all sources for the dart:io library.
+{
+  'sources': [
+    '../../lib/uri/uri.dart',
+  ],
+}