Suppress cloning EventTarget methods in subtypes when using blink

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 229 matching lines @@
 
   def HasEnum(self, enum_name):
     return enum_name in self._enums
 
   def GetEnum(self, enum_name):
     return self._enums[enum_name]
 
   def AddEnum(self, enum):
     self._enums[enum.id] = enum
 
-  def TransitiveSecondaryParents(self, interface):
+  def TransitiveSecondaryParents(self, interface, propagate_event_target):
     """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 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) or parent.type.id == 'EventTarget':
+      if (IsPureInterface(parent.type.id) or
+          (propagate_event_target and parent.type.id == 'EventTarget')):
         walk(interface.parents)
       else:
         walk(interface.parents[1:])
     return result