Allow a single translation to be from multiple differently-named sources

pkg/intl/test/message_extraction/make_hardcoded_translation.dart

 #!/usr/bin/env 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 simulates a translation process, reading the messages generated
  * from extract_message.dart for the files sample_with_messages.dart and
  * part_of_sample_with_messages.dart and writing out hard-coded translations for
  * German and French locales.
@@ skipping 35 matching lines @@
     "dollars \${ (les accolades sont ok), et xml/html réservés <& et "
     "des citations \" "
     "avec quelques paramètres ainsi \$a, \$b, et \$c",
   "method" : "Cela vient d'une méthode",
   "nonLambda" : "Cette méthode n'est pas un lambda",
   "staticMessage" : "Cela vient d'une méthode statique",
   "notAlwaysTranslated" : "Ce manque certaines traductions",
   "thisNameIsNotInTheOriginal" : "Could this lead to something malicious?",
   "originalNotInBMP" : "Anciens caractères grecs jeux du pendu: 𐅆𐅇.",
   "escapable" : "Escapes: \n\r\f\b\t\v.",
+  "sameContentsDifferentName" : "Bonjour tout le monde",
+  "differentNameSameContents" : "Bonjour tout le monde",
   "plurals" : writer.write(new Plural.from("num",
       [
         ["zero", "Est-ce que nulle est pluriel?"],
         ["one", "C'est singulier"],
         ["other", "C'est pluriel (\$num)."]
       ], null)),
   // TODO(alanknight): These are pretty horrible to write out manually. Provide
   // a better way of reading/writing translations. A real format would be good.
   "whereTheyWentMessage" : writer.write(new Gender.from("gender",
     [
@@ skipping 70 matching lines @@
   "trickyInterpolation" :
     r"Interpolation ist schwierig, wenn es einen Satz wie dieser endet ${s}.",
   "message3" : "Zeichen, die Flucht benötigen, zB Schrägstriche \\ Dollar "
     "\${ (geschweiften Klammern sind ok) und xml reservierte Zeichen <& und "
     "Zitate \" Parameter \$a, \$b und \$c",
   "method" : "Dies ergibt sich aus einer Methode",
   "nonLambda" : "Diese Methode ist nicht eine Lambda",
   "staticMessage" : "Dies ergibt sich aus einer statischen Methode",
   "originalNotInBMP" : "Antike griechische Galgenmännchen Zeichen: 𐅆𐅇",
   "escapable" : "Escapes: \n\r\f\b\t\v.",
+  "sameContentsDifferentName" : "Hallo Welt",
+  "differentNameSameContents" : "Hallo Welt",
   "plurals" : writer.write(new Plural.from("num",
     [
       ["zero", "Ist Null Plural?"],
       ["one", "Dies ist einmalig"],
       ["other", "Dies ist Plural (\$num)."]
     ], null)),
   // TODO(alanknight): These are pretty horrible to write out manually. Provide
   // a better way of reading/writing translations. A real format would be good.
   "whereTheyWentMessage" : writer.write(new Gender.from("gender",
     [
@@ skipping 87 matching lines @@
   parser.addOption("output-dir", defaultsTo: '.',
       callback: (value) => targetDir = value);
   parser.parse(args);
 
   var fileArgs = args.where((x) => x.contains('.json'));
 
   var messages = JSON.decode(new File(fileArgs.first).readAsStringSync());
   translate(messages, "fr", french);
   translate(messages, "de_DE", german);
 }