Add a flag to prohibit plurals/genders that don't take up the whole string.

pkg/intl/test/message_extraction/message_extraction_test.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.
 
 library message_extraction_test;
 
 import 'package:unittest/unittest.dart';
 import 'dart:io';
 import 'dart:async';
 import 'dart:convert';
@@ skipping 67 matching lines @@
     }).then(makeSureWeVerify).then(checkResult);
   });
 }
 
 void copyFilesToTempDirectory() {
   if (useLocalDirectory) return;
   var files = [asTestDirPath('sample_with_messages.dart'),
       asTestDirPath('part_of_sample_with_messages.dart'),
       asTestDirPath('verify_messages.dart'),
       asTestDirPath('run_and_verify.dart'),
+      asTestDirPath('embedded_plural_text_before.dart'),
+      asTestDirPath('embedded_plural_text_after.dart'),
       asTestDirPath('print_to_list.dart')];
   for (var filename in files) {
     var file = new File(filename);
     file.copySync(path.join(tempDir, path.basename(filename)));
   }
 }
 
 void deleteGeneratedFiles() {
   if (useLocalDirectory) return;
   try {
@@ skipping 45 matching lines @@
     '--suppress-warnings', 'sample_with_messages.dart',
     'part_of_sample_with_messages.dart']);
 
 Future<ProcessResult> generateTranslationFiles(ProcessResult previousResult) =>
     run(previousResult,
         [asTestDirPath('make_hardcoded_translation.dart'),
         'intl_messages.arb']);
 
 Future<ProcessResult> generateCodeFromTranslation(ProcessResult previousResult)
     => run(previousResult, [asTestDirPath('../../bin/generate_from_arb.dart'),
-    deferredLoadArg, '--generated-file-prefix=foo_', 
+    deferredLoadArg, '--generated-file-prefix=foo_',
     'sample_with_messages.dart', 'part_of_sample_with_messages.dart',
     'translation_fr.arb', 'translation_de_DE.arb']);
 
 Future<ProcessResult> runAndVerify(ProcessResult previousResult) => run(
     previousResult, [asTempDirPath('run_and_verify.dart')]);