Add an empty message to the notification center.

ui/message_center/cocoa/tray_view_controller.h

Index: ui/message_center/cocoa/tray_view_controller.h
diff --git a/ui/message_center/cocoa/tray_view_controller.h b/ui/message_center/cocoa/tray_view_controller.h
index d5f9f1f8876301d9a72e56feeaddafd33960915c..1b6ce54ac6be8ac37fecba50a02787d8e4253990 100644
--- a/ui/message_center/cocoa/tray_view_controller.h
+++ b/ui/message_center/cocoa/tray_view_controller.h
@@ -46,6 +46,11 @@ MESSAGE_CENTER_EXPORT
   // The "Notifications" label at the top.
   base::scoped_nsobject<NSTextField> title_;
 
+  base::scoped_nsobject<NSBox> divider_;

[Robert Sesek, 2014/01/29 16:30:39]

Comment please.

[dewittj, 2014/01/29 21:52:25]

Done.

+
+  // The "Nothing to see here" label in an empty message center.
+  base::scoped_nsobject<NSTextField> emptyDescription_;
+
   // The scroll view that contains all the notifications in its documentView.
   base::scoped_nsobject<NSScrollView> scrollView_;
 
@@ -160,6 +165,8 @@ MESSAGE_CENTER_EXPORT
 - (NSScrollView*)scrollView;
 - (HoverImageButton*)pauseButton;
 - (HoverImageButton*)clearAllButton;
+- (NSTextField*)emptyDescription;

[Robert Sesek, 2014/01/29 16:30:39]

nit: this should match the order of the ivars (in the .mm too)

[dewittj, 2014/01/29 21:52:25]

Done.

+- (NSBox*)divider;
 
 // Setter for changing the animation duration. The testing code could set it
 // to a very small value to expedite the test running.