Fixes for Blink roll.

tools/dom/scripts/htmleventgenerator.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 functionality to generate dart:html event classes."""
 
 import logging
 import monitored
 
@@ skipping 282 matching lines @@
 
       members_emitter.Emit(
           "\n"
           "  $(ANNOTATIONS)Stream<$TYPE> get $(NAME) => "
           "$PROVIDER.forTarget(this);\n",
           ANNOTATIONS=annotations,
           NAME=getter_name,
           PROVIDER=provider,
           TYPE=event_type)
 
+  def _GetRawEvents(self, interface):
+    all_interfaces = ([ interface ] +
+                      self._database.TransitiveSecondaryParents(interface))
+    events = set([])
+    for super_interface in all_interfaces:
+      events = events.union(
+        set([attr.id for attr in super_interface.attributes
+             if attr.type.id == 'EventListener']))
+    return events
+
   def _GetEvents(self, interface, custom_events):
     """ Gets a list of all of the events for the specified interface.
     """
     html_interface_name = interface.doc_js_name
 
-    events = set([attr.id for attr in interface.attributes
-                  if attr.type.id == 'EventListener'])
+    events = self._GetRawEvents(interface)
 
     if html_interface_name in _html_manual_events:
       events.update(_html_manual_events[html_interface_name])
 
     if not events and interface.id not in _html_explicit_event_classes :
       return None
 
     dom_event_names = set()
     for event in events:
       dom_name = event[2:]
@@ skipping 52 matching lines @@
     """
     key = '%s.%s' % (html_interface_name, dom_event_name)
     if key in _html_event_types:
       return _html_event_types[key]
     key = '*.%s' % dom_event_name
     if key in _html_event_types:
       return _html_event_types[key]
     _logger.warn('Cannot resolve event type for %s.%s' %
         (html_interface_name, dom_event_name))
     return None