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 a4f487cfd8b5f175873d3ba5c54ef3a753dd06cc..6bd9e6c6428990929562323e0eef3bbd4756ed95 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -24393,14 +24393,6 @@ class Window extends EventTarget implements WindowBase, WindowTimers native "Win
   @DocsEditable()
   final int screenY;
 
-  @DomName('Window.scrollX')
-  @DocsEditable()
-  final int scrollX;
-
-  @DomName('Window.scrollY')
-  @DocsEditable()
-  final int scrollY;
-
   @DomName('Window.scrollbars')
   @DocsEditable()
   final BarProp scrollbars;
@@ -24966,6 +24958,11 @@ class Window extends EventTarget implements WindowBase, WindowTimers native "Win
   void moveTo(Point p) {
     $dom_moveTo(p.x, p.y);
   }
+
+  int get scrollX => JS('bool', '("scrollX" in #)', this) ? JS('int', 
+      '#.scrollX', this) : document.documentElement.scrollLeft;
+  int get scrollY => JS('bool', '("scrollY" in #)', this) ? JS('int', 
+      '#.scrollY', this) : document.documentElement.scrollTop;
 }
 
 /**