Add constructors to all the event classes.

client/html/src/TextEventWrappingImplementation.dart

Index: client/html/src/TextEventWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_TextEventWrappingImplementation.dart b/client/html/src/TextEventWrappingImplementation.dart
similarity index 58%
rename from client/html/generated/src/wrapping/_TextEventWrappingImplementation.dart
rename to client/html/src/TextEventWrappingImplementation.dart
index f774cb7ac929b35607c3e785c3136df15a9911bc..141378b3698f552e55b3f93594e839764c23681a 100644
--- a/client/html/generated/src/wrapping/_TextEventWrappingImplementation.dart
+++ b/client/html/src/TextEventWrappingImplementation.dart
@@ -2,15 +2,15 @@
 // 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 TextEventWrappingImplementation extends UIEventWrappingImplementation implements TextEvent {
   TextEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
-  String get data() { return _ptr.data; }
-
-  void initTextEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Window viewArg, String dataArg) {
-    _ptr.initTextEvent(typeArg, canBubbleArg, cancelableArg, LevelDom.unwrap(viewArg), dataArg);
-    return;
+  factory TextEventWrappingImplementation(String type, Window view, String data,
+      [bool canBubble = false, bool cancelable = false]) {
+    var e = dom.document.createEvent("TextEvent");
+    e.initTextEvent(type, canBubble, cancelable, LevelDom.unwrap(view), data);
+    return LevelDom.wrapTextEvent(e);
   }
+
+  String get data() { return _ptr.data; }
 }