Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGFEColorMatrixElement.dartdoc

Index: lib/html/doc/interface/SVGFEColorMatrixElement.dartdoc
diff --git a/lib/html/doc/interface/SVGFEColorMatrixElement.dartdoc b/lib/html/doc/interface/SVGFEColorMatrixElement.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 SVGFEColorMatrixElement
+interface SVGFEColorMatrixElement extends SVGElement, SVGFilterPrimitiveStandardAttributes {
+
+  static final int SVG_FECOLORMATRIX_TYPE_HUEROTATE = 3;
+
+  static final int SVG_FECOLORMATRIX_TYPE_LUMINANCETOALPHA = 4;
+
+  static final int SVG_FECOLORMATRIX_TYPE_MATRIX = 1;
+
+  static final int SVG_FECOLORMATRIX_TYPE_SATURATE = 2;
+
+  static final int SVG_FECOLORMATRIX_TYPE_UNKNOWN = 0;
+
+  /** @domName SVGFEColorMatrixElement.in1 */
+  final SVGAnimatedString in1;
+
+  /** @domName SVGFEColorMatrixElement.type */
+  final SVGAnimatedEnumeration type;
+
+  /** @domName SVGFEColorMatrixElement.values */
+  final SVGAnimatedNumberList values;
+}