Added shim for scrollX and scrollY for IE 9.

tools/dom/templates/html/impl/impl_Window.darttemplate

Index: tools/dom/templates/html/impl/impl_Window.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Window.darttemplate b/tools/dom/templates/html/impl/impl_Window.darttemplate
index cf2dd3a5d4ba1978336ce7694f873372059e60c5..06f6c4b576bf02a15e84cde130b26aab9190b9ee 100644
--- a/tools/dom/templates/html/impl/impl_Window.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Window.darttemplate
@@ -281,6 +281,11 @@ $!MEMBERS
   void moveTo(Point p) {
     $dom_moveTo(p.x, p.y);
   }
+
+  int get scrollX() => Device.isIE ? document.documentElement.scrollLeft : 

[blois, 2013/07/25 21:30:03]

Can this use ('scrollX' in window) ? rather than isIE?

And isn't it:
int get scrollX =>

+      $dom_scrollX;
+  int get scrollY() => Device.isIE ? document.documentElement.scrollTop : 
+      $dom_scrollY;
 }
 
 /**