Make sure the document's scroll position is always up-to-date before...

content/renderer/renderer_accessibility.cc

Index: content/renderer/renderer_accessibility.cc
===================================================================
--- content/renderer/renderer_accessibility.cc	(revision 111700)
+++ content/renderer/renderer_accessibility.cc	(working copy)
@@ -81,6 +81,7 @@
     : content::RenderViewObserver(render_view),
       ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)),
       browser_root_(NULL),
+      last_scroll_offset_(gfx::Size()),
       ack_pending_(false),
       logging_(false),
       sent_load_complete_(false) {
@@ -164,6 +165,19 @@
         WebKit::WebAccessibilityNotificationLoadComplete);
   }
 
+  gfx::Size scroll_offset = document.frame()->scrollOffset();
+  if (scroll_offset != last_scroll_offset_) {
+    // Make sure the browser is always aware of the scroll position of
+    // the root document element by posting a generic notification that
+    // will update it.
+    // TODO(dmazzoni): remove this as soon as
+    // https://bugs.webkit.org/show_bug.cgi?id=73460 is fixed.
+    last_scroll_offset_ = scroll_offset;
+    PostAccessibilityNotification(
+        document.accessibilityObject(),
+        WebKit::WebAccessibilityNotificationLayoutComplete);
+  }
+
   if (notification == WebKit::WebAccessibilityNotificationLoadComplete)
     sent_load_complete_ = true;