Add version validation for LookupMap, also add unittest directly in LookupMap (take 2)

pkg/compiler/lib/src/diagnostics/messages.dart

 // Copyright (c) 2011, 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.
 
 
 /**
  * The messages in this file should meet the following guide lines:
  *
  * 1. The message should be a complete sentence starting with an uppercase
  * letter, and ending with a period.
@@ skipping 403 matching lines @@
   UNIMPLEMENTED_GETTER,
   UNIMPLEMENTED_GETTER_ONE,
   UNIMPLEMENTED_IMPLICIT_GETTER,
   UNIMPLEMENTED_IMPLICIT_SETTER,
   UNIMPLEMENTED_METHOD,
   UNIMPLEMENTED_METHOD_CONT,
   UNIMPLEMENTED_METHOD_ONE,
   UNIMPLEMENTED_SETTER,
   UNIMPLEMENTED_SETTER_ONE,
   UNMATCHED_TOKEN,
+  UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
   UNSUPPORTED_BANG_EQ_EQ,
   UNSUPPORTED_EQ_EQ_EQ,
   UNSUPPORTED_LITERAL_SYMBOL,
   UNSUPPORTED_PREFIX_PLUS,
   UNSUPPORTED_THROW_WITHOUT_EXP,
   UNTERMINATED_COMMENT,
   UNTERMINATED_STRING,
   UNTERMINATED_TOKEN,
   UNUSED_CLASS,
   UNUSED_LABEL,
@@ skipping 2854 matching lines @@
           "will be able to perform more optimizations if it is rewritten.",
           howToFix: "Rewrite to "
                     "'noSuchMethod(Invocation i) => super.noSuchMethod(i);'."),
 
       MessageKind.COMPLEX_RETURNING_NSM:
         const MessageTemplate(MessageKind.COMPLEX_RETURNING_NSM,
           "Overriding 'noSuchMethod' causes the compiler to generate "
           "more code and prevents the compiler from doing some optimizations.",
           howToFix: "Consider removing this 'noSuchMethod' implementation."),
 
+      MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP:
+        const MessageTemplate(MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
+          "Unsupported version of package:lookup_map.",
+          howToFix: DONT_KNOW_HOW_TO_FIX),
 
   }; // End of TEMPLATES.
 
   static const String IMPORT_EXPERIMENTAL_MIRRORS_PADDING = '\n*   ';
 
   toString() => template;
 
   Message message([Map arguments = const {}, bool terse = false]) {
     return new Message(this, arguments, terse);
   }
@@ skipping 49 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }