Roll Observatory packages and add a roll script

packages/intl/test/message_extraction/part_of_sample_with_messages.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.part of sample;
+
+part of sample;
+
+class Person {
+  String name;
+  String gender;
+  Person(this.name, this.gender);
+}
+
+class YouveGotMessages {
+
+  // A static message, rather than a standalone function.
+  static staticMessage() =>
+      Intl.message("This comes from a static method", name: 'staticMessage');
+
+  // An instance method, rather than a standalone function.
+  method() => Intl.message("This comes from a method",
+      name: 'YouveGotMessages_method', desc: 'This is a method with a '
+      'long description which spans '
+      'multiple lines.');
+
+  // A non-lambda, i.e. not using => syntax, and with an additional statement
+  // before the Intl.message call.
+  nonLambda() {
+    var aTrueValue = true;
+    var msg = Intl.message("This method is not a lambda", name: 'nonLambda');
+    expect(aTrueValue, isTrue,
+        reason: 'Parser should not fail with additional code.');
+    return msg;
+  }
+
+  plurals(num) => Intl.message("""${Intl.plural(num,
+         zero : 'Is zero plural?',
+         one : 'This is singular.',
+         other : 'This is plural ($num).')
+        }""", name: "plurals", args: [num], desc: "Basic plurals");
+
+  whereTheyWent(Person person, String place) =>
+      whereTheyWentMessage(person.name, person.gender, place);
+
+  whereTheyWentMessage(String name, String gender, String place) {
+    return Intl.message("${Intl.gender(gender,
+            male: '$name went to his $place',
+            female: '$name went to her $place',
+            other: '$name went to its $place')
+        }",
+        name: "whereTheyWentMessage",
+        args: [name, gender, place],
+        desc: 'A person went to some place that they own, e.g. their room');
+  }
+
+  // English doesn't do enough with genders, so this example is French.
+  nested(List people, String place) {
+    var names = people.map((x) => x.name).join(", ");
+    var number = people.length;
+    var combinedGender =
+        people.every((x) => x.gender == "female") ? "female" : "other";
+    if (number == 0) combinedGender = "other";
+
+    nestedMessage(names, number, combinedGender, place) => Intl.message(
+        '''${Intl.gender(combinedGender,
+          other: '${Intl.plural(number,
+            zero: "Personne n'est allé au $place",
+            one: "${names} est allé au $place",
+            other: "${names} sont allés au $place")}',
+          female: '${Intl.plural(number,
+            one: "$names est allée au $place",
+          other: "$names sont allées au $place")}'
+        )}''',
+        name: "nestedMessage", args: [names, number, combinedGender, place]);
+    return nestedMessage(names, number, combinedGender, place);
+  }
+}