UI refinement for left/right ash tray and bubble.

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 2dfe3c42b0b49562780003b2b0fd2d688d99e8ee..9aa9fdc26f4043186b2872fc039eeebc660cffcc 100644
--- a/ash/system/status_area_widget_delegate.cc
+++ b/ash/system/status_area_widget_delegate.cc
@@ -110,10 +110,15 @@ void StatusAreaWidgetDelegate::UpdateLayout() {
     }
   }
   Layout();
+  UpdateWidgetSize();
 }
 
 void StatusAreaWidgetDelegate::ChildPreferredSizeChanged(View* child) {
   // Need to resize the window when trays or items are added/removed.
+  UpdateWidgetSize();
+}
+
+void StatusAreaWidgetDelegate::UpdateWidgetSize() {
   if (GetWidget())
     GetWidget()->SetSize(GetPreferredSize());
 }