Add constructors to all the event classes.

client/html/src/BeforeLoadEventWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
-// WARNING: Do not edit - generated code.
-
 class BeforeLoadEventWrappingImplementation extends EventWrappingImplementation implements BeforeLoadEvent {
   BeforeLoadEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
+  factory BeforeLoadEventWrappingImplementation(String type, String url,

[Jacob, 2011/10/27 21:23:05]

I like that canBubble and cancelable are now always the last args.

[nweiz, 2011/10/27 22:23:54]

Well, they aren't, strictly; they're after all the required args, since they're
optional, but if a function had other args that could be optional I put those
after canBubble and cancelable. I could change it to make them always the last
args if you think that's cleaner.

+      [bool canBubble = false, bool cancelable = false]) {
+    var e = dom.document.createEvent("BeforeLoadEvent");
+    e.initBeforeLoadEvent(type, canBubble, cancelable, url);
+    return LevelDom.wrapBeforeLoadEvent(e);
+  }
+
   String get url() { return _ptr.url; }
-
-  void initBeforeLoadEvent(String type, bool canBubble, bool cancelable, String url) {
-    _ptr.initBeforeLoadEvent(type, canBubble, cancelable, url);
-    return;
-  }
 }