Docserver: Make the hand-written Cron methods run first rather than last, since

chrome/common/extensions/docs/server2/content_providers.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import logging
 from operator import itemgetter
 import posixpath
 
 from chroot_file_system import ChrootFileSystem
 from content_provider import ContentProvider
+from future import Gettable, Future
 from svn_constants import JSON_PATH
 from third_party.json_schema_compiler.memoize import memoize
 
 
 _CONFIG_PATH = '%s/content_providers.json' % JSON_PATH
 
 
 class ContentProviders(object):
   '''Implements the content_providers.json configuration; see
   chrome/common/extensions/docs/templates/json/content_providers.json for its
@@ skipping 74 matching lines @@
           '%s: content provider type "%s" not supported' % (name, type_))
       return None
 
     return ContentProvider(name,
                            self._compiled_fs_factory,
                            file_system,
                            supports_templates=supports_templates,
                            supports_zip=supports_zip)
 
   def Cron(self):
-    for name, config in self._GetConfig().iteritems():
-      self._CreateContentProvider(name, config).Cron()
+    futures = [self._CreateContentProvider(name, config).Cron()
+               for name, config in self._GetConfig().iteritems()]
+    return Future(delegate=Gettable(lambda: [f.Get() for f in futures]))