Add ClipboardEvent for Firefox.

tools/dom/scripts/generator.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 for systems to generate
 Dart APIs from the IDL database."""
 
 import copy
 import json
@@ skipping 106 matching lines @@
     'CSSStyleDeclaration':
         #                    IE                   Firefox
         'CSSStyleDeclaration,MSStyleCSSProperties,CSS2Properties',
 
     'Clipboard': 'Clipboard,DataTransfer',
 
     'ApplicationCache':
         'ApplicationCache,DOMApplicationCache,OfflineResourceList',
 
     'Event':
-        'Event,InputEvent',
+        'Event,InputEvent,ClipboardEvent',
 
     'HTMLTableCellElement':
         'HTMLTableCellElement,HTMLTableDataCellElement,HTMLTableHeaderCellElement',
 
     'GainNode': 'GainNode,AudioGainNode',
 
     'IDBOpenDBRequest':
         'IDBOpenDBRequest,IDBVersionChangeRequest',
 
     'MouseEvent': 'MouseEvent,DragEvent,PointerEvent,MSPointerEvent',
@@ skipping 1178 matching lines @@
     if type_data.clazz == 'BasicTypedList':
       if type_name == 'ArrayBuffer':
         dart_interface_name = 'ByteBuffer'
       else:
         dart_interface_name = self._renamer.RenameInterfaceId(type_name)
       return BasicTypedListIDLTypeInfo(
           type_name, type_data, dart_interface_name, self)
 
     class_name = '%sIDLTypeInfo' % type_data.clazz
     return globals()[class_name](type_name, type_data)