Reapply Futureification.

tools/dom/scripts/systemhtml.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 the system to generate
 Dart:html APIs from the IDL database."""
 
 import emitter
 import monitored
@@ skipping 403 matching lines @@
     self._library_name = self._renamer.GetLibraryName(self._interface)
 
   def Generate(self):
     if 'Callback' in self._interface.ext_attrs:
       self.GenerateCallback()
     else:
       self.GenerateInterface()
 
   def GenerateCallback(self):
     """Generates a typedef for the callback interface."""
-    handlers = [operation for operation in self._interface.operations
-                if operation.id == 'handleEvent']
-    info = AnalyzeOperation(self._interface, handlers)
+    info = GetCallbackInfo(self._interface)
     code = self._library_emitter.FileEmitter(self._interface.id,
         self._library_name)
     code.Emit(self._template_loader.Load('callback.darttemplate'))
 
     typedef_name = self._renamer.RenameInterface(self._interface)
     code.Emit('typedef void $NAME($PARAMS);\n',
               LIBRARYNAME='dart.dom.%s' % self._library_name,
               NAME=typedef_name,
               PARAMS=info.ParametersDeclaration(self._DartType))
     self._backend.GenerateCallback(info)
@@ skipping 416 matching lines @@
   def EmitOperation(self, info, html_name):
     """
     Arguments:
       info: An OperationInfo object.
     """
     if self._HasCustomImplementation(info.name):
       return
 
     if IsPureInterface(self._interface.id):
       self._AddInterfaceOperation(info, html_name)
+    elif info.callback_args:
+      self._AddFutureifiedOperation(info, html_name)
     elif any(self._OperationRequiresConversions(op) for op in info.overloads):
       # Any conversions needed?
       self._AddOperationWithConversions(info, html_name)
     else:
       self._AddDirectNativeOperation(info, html_name)
 
   def _AddDirectNativeOperation(self, info, html_name):
     self._members_emitter.Emit(
         '\n'
         '  $RENAME$ANNOTATIONS$MODIFIERS$TYPE $NAME($PARAMS) native;\n',
@@ skipping 262 matching lines @@
     for library_name in libraries:
       self._libraries[library_name] = DartLibrary(
           library_name, template_loader, library_type, output_dir)
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)