Add dummy dart:html library for documentation.

lib/html/doc/interface/Screen.dart

Index: lib/html/doc/interface/Screen.dart
diff --git a/lib/html/doc/interface/Screen.dart b/lib/html/doc/interface/Screen.dart
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index 0000000000000000000000000000000000000000..fa126a96596656a4f2fa897cd5a728891c281281
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+++ b/lib/html/doc/interface/Screen.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 Screen
+interface Screen {
+
+  /** @domName Screen.availHeight */
+  final int availHeight;
+
+  /** @domName Screen.availLeft */
+  final int availLeft;
+
+  /** @domName Screen.availTop */
+  final int availTop;
+
+  /** @domName Screen.availWidth */
+  final int availWidth;
+
+  /** @domName Screen.colorDepth */
+  final int colorDepth;
+
+  /** @domName Screen.height */
+  final int height;
+
+  /** @domName Screen.pixelDepth */
+  final int pixelDepth;
+
+  /** @domName Screen.width */
+  final int width;
+}