Add constructors to all the event classes.

client/html/generated/src/wrapping/_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) {}
-
-  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;
-  }
-}