Add constructors to all the event classes.

client/html/src/Event.dart

Index: client/html/src/Event.dart
diff --git a/client/html/generated/src/interface/Event.dart b/client/html/src/Event.dart
similarity index 90%
rename from client/html/generated/src/interface/Event.dart
rename to client/html/src/Event.dart
index cd7c20579d620348b637b5407b54ef9672249ab1..52062c731ab5d56d06fd3cb53f869d60e2303ba4 100644
--- a/client/html/generated/src/interface/Event.dart
+++ b/client/html/src/Event.dart
@@ -2,9 +2,7 @@
 // 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.
-
-interface Event {
+interface Event factory EventWrappingImplementation {
 
   static final int AT_TARGET = 2;
 
@@ -44,6 +42,8 @@ interface Event {
 
   static final int SELECT = 16384;
 
+  Event(String type, [bool canBubble, bool cancelable]);
+
   bool get bubbles();
 
   bool get cancelBubble();
@@ -70,8 +70,6 @@ interface Event {
 
   String get type();
 
-  void initEvent(String eventTypeArg, bool canBubbleArg, bool cancelableArg);
-
   void preventDefault();
 
   void stopImmediatePropagation();