Add left/right layout support for uber tray.

ash/wm/status_area_layout_manager.cc

Index: ash/wm/status_area_layout_manager.cc
diff --git a/ash/wm/status_area_layout_manager.cc b/ash/wm/status_area_layout_manager.cc
index cbc28337fcbcef53796b38d76f62aff8519270f8..84b4aa3824e735506f9072a36e0abe00c781ff59 100644
--- a/ash/wm/status_area_layout_manager.cc
+++ b/ash/wm/status_area_layout_manager.cc
@@ -56,7 +56,7 @@ void StatusAreaLayoutManager::SetChildBounds(
 
   // If the size matches, no need to do anything. We don't check the location as
   // that is managed by the shelf.
-  if (requested_bounds.size() == child->bounds().size())
+  if (requested_bounds == child->bounds())
     return;
 
   SetChildBoundsDirect(child, requested_bounds);