Treat EventTarget as a secondary superclass

tools/dom/scripts/database.py

 #!/usr/bin/python
 # 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.
 
 """Module to manage IDL files."""
 
 import copy
 import pickle
 import logging
@@ skipping 238 matching lines @@
 
   def TransitiveSecondaryParents(self, interface):
     """Returns a list of all non-primary parents.
 
     The list contains the interface objects for interfaces defined in the
     database, and the name for undefined interfaces.
     """
     def walk(parents):
       for parent in parents:
         parent_name = parent.type.id
-        if parent_name == 'EventTarget':
-          # Currently EventTarget is implemented as a mixin, not a proper
-          # super interface---ignore its members.
-          continue
         if IsDartCollectionType(parent_name):
           result.append(parent_name)
           continue
         if self.HasInterface(parent_name):
           parent_interface = self.GetInterface(parent_name)
           result.append(parent_interface)
           walk(parent_interface.parents)
 
     result = []
     if interface.parents:
       parent = interface.parents[0]
-      if IsPureInterface(parent.type.id):
+      if IsPureInterface(parent.type.id) or parent.type.id == 'EventTarget':
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
     return result