Fixing up WheelEvent to follow W3C standards and work on all platforms.

lib/html/scripts/systemnative.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 systems to generate
 native binding from the IDL database."""
 
 import emitter
 import os
@@ skipping 157 matching lines @@
 
   def SetImplementationEmitter(self, implementation_emitter):
     self._dart_impl_emitter = implementation_emitter
 
   def ImplementsMergedMembers(self):
     # We could not add merged functions to implementation class because
     # underlying c++ object doesn't implement them. Merged functions are
     # generated on merged interface implementation instead.
     return False
 
+  def HasCustomEventImplementation(self, member_name):
+    return False
+
   def StartInterface(self):
     # Create emitters for c++ implementation.
     if self.HasImplementation():
       cpp_header_path = self._system._FilePathForCppHeader(self._interface.id)
       self._system._cpp_header_files.append(cpp_header_path)
       self._cpp_header_emitter = self._system._emitters.FileEmitter(cpp_header_path)
       cpp_impl_path = self._system._FilePathForCppImplementation(self._interface.id)
       self._system._cpp_impl_files.append(cpp_impl_path)
       self._cpp_impl_emitter = self._system._emitters.FileEmitter(cpp_impl_path)
     else:
@@ skipping 750 matching lines @@
     parent_interface = _FindInHierarchy(database, parent_interface, test)
     if parent_interface:
       return parent_interface
 
 def _ToWebKitName(name):
   name = name[0].lower() + name[1:]
   name = re.sub(r'^(hTML|uRL|jS|xML|xSLT)', lambda s: s.group(1).lower(),
                 name)
   return re.sub(r'^(create|exclusive)', lambda s: 'is' + s.group(1).capitalize(),
                 name)