Fix up dromaeo after lib v2 merge and add Dromaeo smoketest to prevent future

samples/third_party/dromaeo/common/JSON.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.
 
 part of common;
 
 // Pure Dart implementation of JSON protocol.
 
 /**
  * Utility class to parse JSON and serialize objects to JSON.
@@ skipping 44 matching lines @@
   num get number {
     assert(kind == NUMBER);
     return _n;
   }
 
   const JsonToken._internal(this.kind, this._s, this._n);
 
   factory JsonToken.string(String s) {
     return new JsonToken._internal(STRING, s, 0);
   }
-  factory JsonToken.number(num n) {
+  factory JsonToken.numberItem(num n) {
     return new JsonToken._internal(NUMBER, '', n);
   }
   factory JsonToken.atom(int kind) {
     return new JsonToken._internal(kind, '', 0);
   }
 
   String toString() {
     switch (kind) {
       case STRING:
         return 'STRING(${_s})';
@@ skipping 170 matching lines @@
           isInteger = false;
           _pos++;
           c = _s.charCodeAt(_pos);
           if (c == PLUS || c == MINUS) {
             _pos++;
           }
           skipDigits();
         }
 
         final String body = _s.substring(startPos, _pos);
-        return new JsonToken.number(
+        return new JsonToken.numberItem(
             isInteger ?  int.parse(body) : double.parse(body));
 
       case cur == LBRACE:
         _pos++;
         return new JsonToken.atom(JsonToken.LBRACE);
 
       case cur == RBRACE:
         _pos++;
         return new JsonToken.atom(JsonToken.RBRACE);
 
@@ skipping 295 matching lines @@
             _sb.add(',');
           }
         });
         _sb.add('}');
         return;
     } else {
         throw const JsonUnsupportedObjectType();
     }
   }
 }