Implement VariableMirror.isConst in the VM and ParameterMirror.isConst in dart2js.

runtime/lib/mirrors_impl.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.
 
 // VM-specific implementation of the dart:mirrors library.
 
 import "dart:collection";
 
 final emptyList = new UnmodifiableListView([]);
 final emptyMap = new _UnmodifiableMapView({});
@@ skipping 1275 matching lines @@
       native "MethodMirror_source";
 }
 
 class _LocalVariableMirrorImpl extends _LocalDeclarationMirrorImpl
     implements VariableMirror {
   _LocalVariableMirrorImpl(reflectee,
                            String simpleName,
                            this.owner,
                            this._type,
                            this.isStatic,
-                           this.isFinal)
+                           this.isFinal,
+                           this.isConst)
       : super(reflectee, _s(simpleName));
 
   final DeclarationMirror owner;
   final bool isStatic;
   final bool isFinal;
+  final bool isConst;
 
   bool get isPrivate => _n(simpleName).startsWith('_');
 
   bool get isTopLevel => owner is LibraryMirror;
 
   SourceLocation get location {
     throw new UnimplementedError('VariableMirror.location is not implemented');
   }
 
   TypeMirror _type;
@@ skipping 20 matching lines @@
                             this.isOptional,
                             this.isNamed,
                             bool isFinal,
                             this._defaultValueReflectee,
                             this._unmirroredMetadata)
       : super(reflectee,
               simpleName,
               owner,
               null,  // We override the type.
               false, // isStatic does not apply.
-              isFinal);
+              isFinal,
+              false  // Not const.
+              );
 
   final int _position;
   final bool isOptional;
   final bool isNamed;
   final List _unmirroredMetadata;
 
   Object _defaultValueReflectee;
   InstanceMirror _defaultValue;
   InstanceMirror get defaultValue {
     if (!isOptional) {
@@ skipping 115 matching lines @@
     if (typeMirror == null) {
       typeMirror = makeLocalTypeMirror(key);
       _instanitationCache[key] = typeMirror;
       if (typeMirror is ClassMirror && !typeMirror._isGeneric) {
         _declarationCache[key] = typeMirror;
       }
     }
     return typeMirror;
   }
 }