Adapting observe to use smoke (this is built on top of the previous change that

pkg/smoke/lib/static.dart

 // Copyright (c) 2014, 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.
 
 /// Static implementation of smoke services using code-generated data.
 library smoke.static;
 
 import 'dart:math' as math;
 
 import 'package:logging/logging.dart';
@@ skipping 146 matching lines @@
       }
       result = (superclass == Object) ? [] : query(superclass, options);
     } else {
       result = [];
     }
     var map = _configuration.declarations[type];
     if (map == null) {
       throw new MissingCodeException('declarations for $type');
     }
     for (var decl in map.values) {
+      if (!options.includeFields && decl.isField) continue;
       if (!options.includeProperties && decl.isProperty) continue;
       if (options.excludeFinal && decl.isFinal) continue;
       if (!options.includeMethods && decl.isMethod) continue;
       if (options.withAnnotations != null &&
           !matchesAnnotation(decl.annotations, options.withAnnotations)) {
         continue;
       }
       result.add(decl);
     }
     return result;
@@ skipping 25 matching lines @@
       if (declaration != null) return declaration;
     }
     var parentType = _configuration.parents[type];
     if (parentType == null) {
       throw new MissingCodeException('superclass of "$type"');
     }
     type = parentType;
   }
   return null;
 }