Roll Observatory packages and add a roll script

packages/intl/test/find_default_locale_browser_test.dart

+// 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.
+
+library find_default_locale_browser_test;
+
+import 'package:intl/intl.dart';
+import 'package:intl/intl_browser.dart';
+import 'package:unittest/unittest.dart';
+
+main() {
+  test("Find system locale in browser", () {
+    // TODO (alanknight): This only verifies that we found some locale. We
+    // should find a way to force the system locale before the test is run
+    // and then verify that it's actually the correct value.
+    Intl.systemLocale = 'xx_YY';
+    var callback = expectAsync(verifyLocale);
+    findSystemLocale().then(callback);
+  });
+}
+
+verifyLocale(_) {
+  expect(Intl.systemLocale, isNot(equals("xx_YY")));
+  // Allow either en_US or just en type locales. Windows in particular may
+  // give us just ru for ru_RU
+  var pattern = new RegExp(r"\w\w_[A-Z0-9]+");
+  var shortPattern = new RegExp(r"\w\w");
+  var match = pattern.hasMatch(Intl.systemLocale);
+  var shortMatch = shortPattern.hasMatch(Intl.systemLocale);
+  expect(match || shortMatch, isTrue);
+}