Add constructors to all the event classes.

client/html/src/PageTransitionEventWrappingImplementation.dart

Index: client/html/src/PageTransitionEventWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_PageTransitionEventWrappingImplementation.dart b/client/html/src/PageTransitionEventWrappingImplementation.dart
similarity index 51%
rename from client/html/generated/src/wrapping/_PageTransitionEventWrappingImplementation.dart
rename to client/html/src/PageTransitionEventWrappingImplementation.dart
index 1a3e7eb4e206277ecb1ff7f4b9dda706778e71f1..4e9eff2876225a33558a8def7e2d7706e9b2b22b 100644
--- a/client/html/generated/src/wrapping/_PageTransitionEventWrappingImplementation.dart
+++ b/client/html/src/PageTransitionEventWrappingImplementation.dart
@@ -2,15 +2,16 @@
 // 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 PageTransitionEventWrappingImplementation extends EventWrappingImplementation implements PageTransitionEvent {
-  PageTransitionEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
-
-  bool get persisted() { return _ptr.persisted; }
+  PageTransitionEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
-  void initPageTransitionEvent(String typeArg, bool canBubbleArg, bool cancelableArg, bool persisted) {
-    _ptr.initPageTransitionEvent(typeArg, canBubbleArg, cancelableArg, persisted);
-    return;
+  factory PageTransitionEventWrappingImplementation(String type,
+      [bool canBubble = true, bool cancelable = true,
+      bool persisted = false]) {
+    final e = dom.document.createEvent("PageTransitionEvent");
+    e.initPageTransitionEvent(type, canBubble, cancelable, persisted);
+    return LevelDom.wrapPageTransitionEvent(e);
   }
+
+  bool get persisted() => _ptr.persisted;
 }