Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGRenderingIntent.dartdoc

Index: lib/html/doc/interface/SVGRenderingIntent.dartdoc
diff --git a/lib/html/doc/interface/SVGRenderingIntent.dartdoc b/lib/html/doc/interface/SVGRenderingIntent.dartdoc
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+++ b/lib/html/doc/interface/SVGRenderingIntent.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 SVGRenderingIntent
+interface SVGRenderingIntent {
+
+  static final int RENDERING_INTENT_ABSOLUTE_COLORIMETRIC = 5;
+
+  static final int RENDERING_INTENT_AUTO = 1;
+
+  static final int RENDERING_INTENT_PERCEPTUAL = 2;
+
+  static final int RENDERING_INTENT_RELATIVE_COLORIMETRIC = 3;
+
+  static final int RENDERING_INTENT_SATURATION = 4;
+
+  static final int RENDERING_INTENT_UNKNOWN = 0;
+}