Fix shelf layout when switching from left-aligned shelf to right-aligned shelf

ash/system/status_area_widget_delegate.cc

Index: ash/system/status_area_widget_delegate.cc
diff --git a/ash/system/status_area_widget_delegate.cc b/ash/system/status_area_widget_delegate.cc
index 08c580e4254b32802b701bbd0d9d408edcfaf97d..caef1a62e62b788c1ffb2a2b8ea54f12e7869f10 100644
--- a/ash/system/status_area_widget_delegate.cc
+++ b/ash/system/status_area_widget_delegate.cc
@@ -163,6 +163,7 @@ void StatusAreaWidgetDelegate::UpdateLayout() {
   StatusAreaWidgetDelegateAnimationSettings settings(layer());
 
   Layout();
+  View::InvalidateLayout();

[James Cook, 2016/06/29 21:23:37]

It seems a little weird to call View::Layout() then immediately call
View::InvalidateLayout().

If you need to invalidate the layout of all the parent views, it might work to
call it at the start of UpdateLayout(). If that works, it is what I would
prefer.

If you really have to do it after Layout() there is probably only one specific
case where you need it (like after the call to UpdateLayout in
StatusAreaWidget::SetShelfAlignment()).

Either way this needs a comment explaining why you have to do it.

Also, you don't need View::.

   UpdateWidgetSize();
 }