Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGPathSegArcAbs.dart

Index: lib/html/doc/interface/SVGPathSegArcAbs.dart
diff --git a/lib/html/doc/interface/SVGPathSegArcAbs.dart b/lib/html/doc/interface/SVGPathSegArcAbs.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 SVGPathSegArcAbs
+interface SVGPathSegArcAbs extends SVGPathSeg {
+
+  /** @domName SVGPathSegArcAbs.angle */
+  num angle;
+
+  /** @domName SVGPathSegArcAbs.largeArcFlag */
+  bool largeArcFlag;
+
+  /** @domName SVGPathSegArcAbs.r1 */
+  num r1;
+
+  /** @domName SVGPathSegArcAbs.r2 */
+  num r2;
+
+  /** @domName SVGPathSegArcAbs.sweepFlag */
+  bool sweepFlag;
+
+  /** @domName SVGPathSegArcAbs.x */
+  num x;
+
+  /** @domName SVGPathSegArcAbs.y */
+  num y;
+}