Add dummy dart:html library for documentation.

lib/html/doc/interface/TouchEvent.dart

Index: lib/html/doc/interface/TouchEvent.dart
diff --git a/lib/html/doc/interface/TouchEvent.dart b/lib/html/doc/interface/TouchEvent.dart
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index 0000000000000000000000000000000000000000..d9159a4eb10dc9e0c9f911921b8a0b7b09e9b7a6
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+++ b/lib/html/doc/interface/TouchEvent.dart
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+// Copyright (c) 2012, 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.
+
+/// @domName TouchEvent
+interface TouchEvent extends UIEvent {
+
+  /** @domName TouchEvent.altKey */
+  final bool altKey;
+
+  /** @domName TouchEvent.changedTouches */
+  final TouchList changedTouches;
+
+  /** @domName TouchEvent.ctrlKey */
+  final bool ctrlKey;
+
+  /** @domName TouchEvent.metaKey */
+  final bool metaKey;
+
+  /** @domName TouchEvent.shiftKey */
+  final bool shiftKey;
+
+  /** @domName TouchEvent.targetTouches */
+  final TouchList targetTouches;
+
+  /** @domName TouchEvent.touches */
+  final TouchList touches;
+
+  /** @domName TouchEvent.initTouchEvent */
+  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);
+}