Add dummy dart:html library for documentation.

lib/html/doc/interface/SVGImageElement.dartdoc

Index: lib/html/doc/interface/SVGImageElement.dartdoc
diff --git a/lib/html/doc/interface/SVGImageElement.dartdoc b/lib/html/doc/interface/SVGImageElement.dartdoc
new file mode 100644
index 0000000000000000000000000000000000000000..10c87db0354b05bb3877acb48fb93d778808f6af
--- /dev/null
+++ b/lib/html/doc/interface/SVGImageElement.dartdoc
@@ -0,0 +1,26 @@
+// 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 SVGImageElement
+interface SVGImageElement extends SVGElement, SVGURIReference, SVGTests, SVGLangSpace, SVGExternalResourcesRequired, SVGStylable, SVGTransformable {
+
+  /** @domName SVGImageElement.height */
+  final SVGAnimatedLength height;
+
+  /** @domName SVGImageElement.preserveAspectRatio */
+  final SVGAnimatedPreserveAspectRatio preserveAspectRatio;
+
+  /** @domName SVGImageElement.width */
+  final SVGAnimatedLength width;
+
+  /** @domName SVGImageElement.x */
+  final SVGAnimatedLength x;
+
+  /** @domName SVGImageElement.y */
+  final SVGAnimatedLength y;
+}