ParameterMirror: Implement some missing getters.

tests/lib/mirrors/stringify.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.
 
 /// Helper methods for converting a [Mirror] to a [String].
 library test.stringify;
 
 import 'dart:mirrors';
 
 import 'package:expect/expect.dart';
@@ skipping 48 matching lines @@
   var buffer = new StringBuffer();
   writeVariableOn(variable, buffer);
   return 'Variable($buffer)';
 }
 
 stringifyParameter(ParameterMirror parameter) {
   var buffer = new StringBuffer();
   writeVariableOn(parameter, buffer);
   if (parameter.isOptional) buffer.write(', optional');
   if (parameter.isNamed) buffer.write(', named');
-  if (parameter.hasDefaultValue) {
-    buffer.write(', value = ${stringify(parameter.defaultValue)}');
-  }
+  // TODO(6490,12430): Add this check as soon as it's properly implemented in
+  // the VM and dart2js.
+  // if (parameter.hasDefaultValue) {
+  //  buffer.write(', value = ${stringify(parameter.defaultValue)}');
+  // }
   // TODO(ahe): Move to writeVariableOn.
   buffer.write(', type = ${stringify(parameter.type)}');
   return 'Parameter($buffer)';
 }
 
 stringifyType(TypeMirror type) {
   var buffer = new StringBuffer();
   writeDeclarationOn(type, buffer);
   return 'Type($buffer)';
 }
@@ skipping 25 matching lines @@
   if (value is TypeMirror) return stringifyType(value);
   if (value == null) return '<null>';
   throw 'Unexpected value: $value';
 }
 
 expect(expected, actual) => Expect.stringEquals(expected, stringify(actual));
 
 compareSymbols(Symbol a, Symbol b) {
   return MirrorSystem.getName(a).compareTo(MirrorSystem.getName(b));
 }