Update dart2js diagnostics to prepare for filtering.

tests/compiler/dart2js/parser_helper.dart

 // Copyright (c) 2012, 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 parser_helper;
 
 import "package:expect/expect.dart";
 
 import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart";
@@ skipping 22 matching lines @@
   }
 
   void internalErrorOnElement(element, String message) {
     log(message);
   }
 
   void internalError(String message, {node, token, instruction, element}) {
     log(message);
   }
 
-  SourceSpan spanFromSpannable(node, [uri]) {
+  SourceSpan spanFromSpannable(node) {
     throw 'unsupported operation';
   }
 
   void reportMessage(SourceSpan span, Diagnostic message, kind) {
     log(message);
   }
 
   void reportError(Spannable node, MessageKind errorCode, [Map arguments]) {
     log(new Message(errorCode, arguments, false));
   }
 
+  void reportWarningCode(Spannable node, MessageKind errorCode, [Map arguments]) {

[floitsch, 2014/02/19 14:57:40]

long line.

Why do we need a reportWarningCode?
Shouldn't it be simply reportWarning?

[Johnni Winther, 2014/02/20 09:35:40]

Nice catch. Renamed.

+    log(new Message(errorCode, arguments, false));
+  }
+
   void reportInfo(Spannable node, MessageKind errorCode, [Map arguments]) {
     log(new Message(errorCode, arguments, false));
   }
 
   withCurrentElement(Element element, f()) => f();
 }
 
 Token scan(String text) => new StringScanner.fromString(text).tokenize();
 
 Node parseBodyCode(String text, Function parseMethod,
@@ skipping 53 matching lines @@
   ElementListener listener = new ElementListener(compiler, unit, () => id++);
   PartialParser parser = new PartialParser(listener);
   compiler.withCurrentElement(unit, () => parser.parseUnit(tokens));
   return unit.localMembers;
 }
 
 NodeList fullParseUnit(String source, {DiagnosticListener diagnosticHandler}) {
   return parseBodyCode(source, (parser, tokens) => parser.parseUnit(tokens),
                        diagnosticHandler: diagnosticHandler);
 }