Add dummy dart:html library for documentation.

lib/html/doc/interface/CSSTransformValue.dartdoc

Index: lib/html/doc/interface/CSSTransformValue.dartdoc
diff --git a/lib/html/doc/interface/CSSTransformValue.dartdoc b/lib/html/doc/interface/CSSTransformValue.dartdoc
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+++ b/lib/html/doc/interface/CSSTransformValue.dartdoc
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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:
+//   This file contains documentation that is merged into the real source.
+//   Do not make code changes here.
+
+/// @domName WebKitCSSTransformValue
+interface CSSTransformValue extends CSSValueList {
+
+  static final int CSS_MATRIX = 11;
+
+  static final int CSS_MATRIX3D = 21;
+
+  static final int CSS_PERSPECTIVE = 20;
+
+  static final int CSS_ROTATE = 4;
+
+  static final int CSS_ROTATE3D = 17;
+
+  static final int CSS_ROTATEX = 14;
+
+  static final int CSS_ROTATEY = 15;
+
+  static final int CSS_ROTATEZ = 16;
+
+  static final int CSS_SCALE = 5;
+
+  static final int CSS_SCALE3D = 19;
+
+  static final int CSS_SCALEX = 6;
+
+  static final int CSS_SCALEY = 7;
+
+  static final int CSS_SCALEZ = 18;
+
+  static final int CSS_SKEW = 8;
+
+  static final int CSS_SKEWX = 9;
+
+  static final int CSS_SKEWY = 10;
+
+  static final int CSS_TRANSLATE = 1;
+
+  static final int CSS_TRANSLATE3D = 13;
+
+  static final int CSS_TRANSLATEX = 2;
+
+  static final int CSS_TRANSLATEY = 3;
+
+  static final int CSS_TRANSLATEZ = 12;
+
+  /** @domName WebKitCSSTransformValue.operationType */
+  final int operationType;
+}