Use Blink IDL parser for dart libraries.

tools/dom/scripts/dartmetadata.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 module provides shared functionality to provide Dart metadata for
 DOM APIs.
 """
 
 import copy
@@ skipping 558 matching lines @@
     "@SupportedBrowser(SupportedBrowser.CHROME)",
     "@SupportedBrowser(SupportedBrowser.FIREFOX)",
     "@SupportedBrowser(SupportedBrowser.SAFARI)",
   ],
 })
 
 # TODO(blois): minimize noise and enable by default.
 _monitor_type_metadata = False
 
 class DartMetadata(object):
-  def __init__(self, api_status_path, doc_comments_path):
+  def __init__(self, api_status_path, doc_comments_path,
+               logging_level=logging.WARNING):
+    _logger.setLevel(logging_level)
     self._api_status_path = api_status_path
     status_file = open(self._api_status_path, 'r+')
     self._types = json.load(status_file)
     status_file.close()
 
     comments_file = open(doc_comments_path, 'r+')
     self._doc_comments = json.load(comments_file)
     comments_file.close()
 
     if _monitor_type_metadata:
@@ skipping 229 matching lines @@
       pass
     else:
       _logger.warn('Unknown support_level - %s:%s' % (interface_id, member_id))
 
     return annotations
 
   def Flush(self):
     json_file = open(self._api_status_path, 'w+')
     json.dump(self._types, json_file, indent=2, separators=(',', ': '), sort_keys=True)
     json_file.close()