Add constructors to all the event classes.

client/html/src/DeviceOrientationEventWrappingImplementation.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 DeviceOrientationEventWrappingImplementation extends EventWrappingImplementation implements DeviceOrientationEvent {
   DeviceOrientationEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
 
+  factory DeviceOrientationEventWrappingImplementation(String type,
+      double alpha, double beta, double gamma, [bool canBubble = false,
+      bool cancelable = false]) {
+    var e = dom.document.createEvent("DeviceOrientationEvent");
+    e.initDeviceOrientationEvent(
+        type, canBubble, cancelable, alpha, beta, gamma);
+    return LevelDom.wrapDeviceOrientationEvent(e);
+  }
+
   num get alpha() { return _ptr.alpha; }
 
   num get beta() { return _ptr.beta; }
 
   num get gamma() { return _ptr.gamma; }
-
-  void initDeviceOrientationEvent(String type, bool bubbles, bool cancelable, num alpha, num beta, num gamma) {
-    _ptr.initDeviceOrientationEvent(type, bubbles, cancelable, alpha, beta, gamma);
-    return;
-  }
 }