Add constructors to all the event classes.

client/html/src/TransitionEvent.dart

Index: client/html/src/TransitionEvent.dart
diff --git a/client/html/generated/src/interface/TransitionEvent.dart b/client/html/src/TransitionEvent.dart
similarity index 55%
rename from client/html/generated/src/interface/TransitionEvent.dart
rename to client/html/src/TransitionEvent.dart
index b40cf81150d32775f73855f8b7806a1b291f2191..2898877a00255563c86195c8bec40a5ba1eca931 100644
--- a/client/html/generated/src/interface/TransitionEvent.dart
+++ b/client/html/src/TransitionEvent.dart
@@ -2,13 +2,12 @@
 // 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 TransitionEvent extends Event factory TransitionEventWrappingImplementation {
 
-interface TransitionEvent extends Event {
+  TransitionEvent(String type, String propertyName, double elapsedTime,
+      [bool canBubble, bool cancelable]);
 
   num get elapsedTime();
 
   String get propertyName();
-
-  void initWebKitTransitionEvent(String typeArg, bool canBubbleArg, bool cancelableArg, String propertyNameArg, num elapsedTimeArg);
 }