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

pkg/intl/test/message_extraction/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.
 
 /**
  * This is a program with various [Intl.message] messages. It just prints
  * all of them, and is used for testing of message extraction, translation,
  * and code generation.
  */
 library sample;
@@ skipping 92 matching lines @@
     name: "nestedSelect",
     args: [currency, amount]);
 
 // A trivial nested plural/gender where both are done directly rather than
 // in interpolations.
 nestedOuter(number, gen) => Intl.plural(number,
     other: Intl.gender(gen, male: "$number male", other: "$number other"),
     name: 'nestedOuter',
     args: [number, gen]);
 
+sameContentsDifferentName() => Intl.message("Hello World",
+    name: "sameContentsDifferentName",
+    desc: "One of two messages with the same contents, but different names");
+
+differentNameSameContents() => Intl.message("Hello World",
+    name: "differentNameSameContents",
+    desc: "One of two messages with the same contents, but different names");
+
 printStuff(Intl locale) {
 
   // Use a name that's not a literal so this will get skipped. Then we have
   // a name that's not in the original but we include it in the French
   // translation. Because it's not in the original it shouldn't get included
   // in the generated catalog and shouldn't get translated.
   if (locale.locale == 'fr') {
     var badName = "thisNameIsNotInTheOriginal";
     var notInOriginal = Intl.message("foo", name: badName);
     if (notInOriginal != "foo") {
@@ skipping 63 matching lines @@
     printOut(outerPlural(1));
     printOut(outerGender("male"));
     printOut(outerGender("female"));
     printOut(nestedOuter(7, "male"));
     printOut(outerSelect("CDN", 7));
     printOut(outerSelect("EUR", 5));
     printOut(nestedSelect("CDN", 1));
     printOut(nestedSelect("CDN", 2));
     printOut(pluralThatFailsParsing(1));
     printOut(pluralThatFailsParsing(2));
+    printOut(differentNameSameContents());
+    printOut(sameContentsDifferentName());
   });
 }
 
 var localeToUse = 'en_US';
 
 main() {
   var fr = new Intl("fr");
   var english = new Intl("en_US");
   var de = new Intl("de_DE");
   // Throw in an initialize of a null locale to make sure it doesn't throw.
   initializeMessages(null);
   var f1 = initializeMessages(fr.locale).then((_) => printStuff(fr));
   var f2 = initializeMessages(de.locale).then((_) => printStuff(de));
   printStuff(english);
   return Future.wait([f1, f2]);
 }