When invalidating memcache, also invalidate the cache for dart

app/models/package.py

 # 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.
 
 import cgi
 import json
 import logging
 
 from google.appengine.api import memcache
 from google.appengine.api import users
@@ skipping 208 matching lines @@
 
     def invalidate_cache(self):
         """Clears the cached JSON for the package.
 
         This must be called any time any data that is in the JSON for the full
         description of the package changes. This isn't often since most package
         data is immutable, but when the uploader list changes or new versions
         of the package are uploaded, the data will change.
         """
         memcache.delete(self._package_json_cache_key)
+        memcache.delete(self._dart_package_json_cache_key)
 
     @property
     def _package_json_cache_key(self):
         """The memcache key for the cached JSON for this package."""
         return 'package_json_' + self.name
+
+    @property
+    def _dart_package_json_cache_key(self):
+        """The Dart memcache key for the cached JSON for this package."""
+        return 'dart_package_json_' + self.name