Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGGlyphRefElement.dartdoc

Index: lib/html/doc/interface/SVGGlyphRefElement.dartdoc
diff --git a/lib/html/doc/interface/SVGGlyphRefElement.dartdoc b/lib/html/doc/interface/SVGGlyphRefElement.dartdoc
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index 0000000000000000000000000000000000000000..a262c2b8f8cd4b2eee271eb3f5283c01248e0e81
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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 SVGGlyphRefElement
+interface SVGGlyphRefElement extends SVGElement, SVGURIReference, SVGStylable {
+
+  /** @domName SVGGlyphRefElement.dx */
+  num dx;
+
+  /** @domName SVGGlyphRefElement.dy */
+  num dy;
+
+  /** @domName SVGGlyphRefElement.format */
+  String format;
+
+  /** @domName SVGGlyphRefElement.glyphRef */
+  String glyphRef;
+
+  /** @domName SVGGlyphRefElement.x */
+  num x;
+
+  /** @domName SVGGlyphRefElement.y */
+  num y;
+}