Make close button visible when focusing inline actions.

ui/message_center/views/notification_view.h

Index: ui/message_center/views/notification_view.h
diff --git a/ui/message_center/views/notification_view.h b/ui/message_center/views/notification_view.h
index 7fa691aff2549c245c7e95f39f5ad3b8b060deb5..9725caf41b9c42a38557995be29f5e2b7283a86b 100644
--- a/ui/message_center/views/notification_view.h
+++ b/ui/message_center/views/notification_view.h
@@ -94,6 +94,9 @@ class MESSAGE_CENTER_EXPORT NotificationView
   int GetMessageLineLimit(int title_lines, int width) const;
   int GetMessageHeight(int width, int limit) const;
 
+  // True if this view or its descendant views have focus.
+  bool HasFocusedView();
+
   // Formats the context message to be displayed based on |context|
   // so it shows as much information as possible
   // given the space available in the ContextMessage section of the