Make docgen able to generate pkg docs and save the package names

pkg/docgen/bin/upload_docgen.py

 #!/usr/bin/python
 #
 # 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.
 
 """ This file will run docgen.dart on the SDK libraries, and upload them to 
   Google Cloud Storage for the documentation viewer. 
 """
 
@@ skipping 51 matching lines @@
 
 
 def main():
   GetOptions()
 
   SetGsutil()
 
   # Execute Docgen.dart on the SDK.
   ExecuteCommand([DART, '--checked', '--package-root=' + PACKAGE_ROOT, 
       abspath(join(dirname(__file__), 'docgen.dart')), 
-      '--parse-sdk'])
+      '--parse-sdk', '--json'])
   
   # Use SVN Revision to get the revision number.
   revision = utils.GetSVNRevision()
   if revision is None:
     # Try to find the version from the dart-sdk folder. 
     revision_file_location = abspath(join(dirname(__file__), 
         '../../../%s/%s/dart-sdk/revision' % (utils.BUILD_ROOT[utils.GuessOS()],
         utils.GetBuildConf('release', utils.GuessArchitecture()))))
     with open(revision_file_location, 'r') as revision_file:
       revision = revision_file.readline(5)
@@ skipping 12 matching lines @@
     version_file.close()
   Upload('./VERSION', GS_SITE + '/VERSION')
 
   # Clean up the files it creates. 
   ExecuteCommand(['rm', '-rf', './docs'])
   ExecuteCommand(['rm', '-f', './VERSION'])
 
 
 if __name__ == '__main__':
   main()