Let EventTarget be a base class in the frog dom.

client/dom/scripts/dartgenerator.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 generates Dart APIs from the IDL database."""
 
 import emitter
 import idlnode
 import logging
@@ skipping 1970 matching lines @@
 
   def StartInterface(self):
     interface = self._interface
     interface_name = interface.id
 
     self._class_name = self._ImplClassName(interface_name)
 
     base = None
     if interface.parents:
       supertype = interface.parents[0].type.id
-      # FIXME: We're currently injecting List<..> and EventTarget as
-      # supertypes in dart.idl. We should annotate/preserve as
-      # attributes instead.  For now, this hack lets the interfaces
-      # inherit, but not the classes.
-      if (not _IsDartListType(supertype) and
-          not supertype == 'EventTarget'):
-        base = self._ImplClassName(supertype)
       if _IsDartCollectionType(supertype):
         # List methods are injected in AddIndexer.
         pass
-      elif supertype == 'EventTarget':
-        # Most implementors of EventTarget specify the EventListener operations
-        # again.  If the operations are not specified, try to inherit from the
-        # EventTarget implementation.
-        #
-        # Applies to MessagePort.
-        if not [op for op in interface.operations if op.id == 'addEventListener']:
-          base = self._ImplClassName(supertype)
       else:
         base = self._ImplClassName(supertype)
 
     if interface_name in _frog_dom_custom_native_specs:
       native_spec = _frog_dom_custom_native_specs[interface_name]
     else:
       # Make the class 'hidden' so it is dynamically patched at runtime.  This
       # is useful not only for browser compat, but to allow code that links
       # against dart:dom to load in a worker isolate.
       native_spec = '*' + interface_name
@@ skipping 485 matching lines @@
                    INDENT=indent,
                    NATIVENAME=native_name,
                    ARGS=argument_expressions)
 
     self._members_emitter.Emit('  $TYPE $NATIVE_NAME($PARAMS) native '
                                '"$(INTERFACE)$(NATIVE_NAME)_Callback";\n',
                                NATIVE_NAME=native_name,
                                TYPE=info.type_name,
                                PARAMS=', '.join(arg_names),
                                INTERFACE=self._interface.id)