Add constructors to all the event classes.

client/html/generated/src/wrapping/_TouchEventWrappingImplementation.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 TouchEventWrappingImplementation extends UIEventWrappingImplementation implements TouchEvent {
-  TouchEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
-
-  bool get altKey() { return _ptr.altKey; }
-
-  TouchList get changedTouches() { return LevelDom.wrapTouchList(_ptr.changedTouches); }
-
-  bool get ctrlKey() { return _ptr.ctrlKey; }
-
-  bool get metaKey() { return _ptr.metaKey; }
-
-  bool get shiftKey() { return _ptr.shiftKey; }
-
-  TouchList get targetTouches() { return LevelDom.wrapTouchList(_ptr.targetTouches); }
-
-  TouchList get touches() { return LevelDom.wrapTouchList(_ptr.touches); }
-
-  void initTouchEvent(TouchList touches, TouchList targetTouches, TouchList changedTouches, String type, Window view, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey) {
-    _ptr.initTouchEvent(LevelDom.unwrap(touches), LevelDom.unwrap(targetTouches), LevelDom.unwrap(changedTouches), type, LevelDom.unwrap(view), screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey);
-    return;
-  }
-}