Fix allow DOMRectList as well as ClientRectList.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 2fcf01a5398902463870fe2d85891b19d9508cc7..15033a6e31ca27322b4368dbe9d3f249f6964b2b 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -30126,7 +30126,7 @@ class _JenkinsSmiHash {
 
 @DocsEditable()
 @DomName('ClientRectList')
-class _ClientRectList extends Interceptor with ListMixin<Rectangle>, ImmutableListMixin<Rectangle> implements List<Rectangle>, JavaScriptIndexingBehavior native "ClientRectList" {
+class _ClientRectList extends Interceptor with ListMixin<Rectangle>, ImmutableListMixin<Rectangle> implements List<Rectangle>, JavaScriptIndexingBehavior native "ClientRectList,DOMRectList" {
   // To suppress missing implicit constructor warnings.
   factory _ClientRectList._() { throw new UnsupportedError("Not supported"); }