Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGPreserveAspectRatio.dartdoc

Index: lib/html/doc/interface/SVGPreserveAspectRatio.dartdoc
diff --git a/lib/html/doc/interface/SVGPreserveAspectRatio.dartdoc b/lib/html/doc/interface/SVGPreserveAspectRatio.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 SVGPreserveAspectRatio
+interface SVGPreserveAspectRatio {
+
+  static final int SVG_MEETORSLICE_MEET = 1;
+
+  static final int SVG_MEETORSLICE_SLICE = 2;
+
+  static final int SVG_MEETORSLICE_UNKNOWN = 0;
+
+  static final int SVG_PRESERVEASPECTRATIO_NONE = 1;
+
+  static final int SVG_PRESERVEASPECTRATIO_UNKNOWN = 0;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMAXYMAX = 10;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMAXYMID = 7;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMAXYMIN = 4;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMIDYMAX = 9;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMIDYMID = 6;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMIDYMIN = 3;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMINYMAX = 8;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMINYMID = 5;
+
+  static final int SVG_PRESERVEASPECTRATIO_XMINYMIN = 2;
+
+  /** @domName SVGPreserveAspectRatio.align */
+  int align;
+
+  /** @domName SVGPreserveAspectRatio.meetOrSlice */
+  int meetOrSlice;
+}