Update Mac notification tray behavior.

ui/message_center/cocoa/status_item_view.h

Index: ui/message_center/cocoa/status_item_view.h
diff --git a/ui/message_center/cocoa/status_item_view.h b/ui/message_center/cocoa/status_item_view.h
index f317dff506a98aff2652073e4bbbcd932e82cb5a..6bde3e62b7a72514a76fef4fa5c543d5aa760d5f 100644
--- a/ui/message_center/cocoa/status_item_view.h
+++ b/ui/message_center/cocoa/status_item_view.h
@@ -35,6 +35,9 @@ MESSAGE_CENTER_EXPORT
   // The unread count number to be drawn next to the icon.
   size_t unreadCount_;
 
+  // Whether or not we are to display the quiet mode version of the status icon.
+  BOOL quietMode_;
+
   // Whether or not to force the highlight pattern to be drawn.
   BOOL highlight_;
 
@@ -44,12 +47,14 @@ MESSAGE_CENTER_EXPORT
 }
 
 @property(copy, nonatomic) message_center::StatusItemClickedCallack callback;
-@property(nonatomic) size_t unreadCount;
 @property(nonatomic) BOOL highlight;
 
 // Designated initializer. Creates a new NSStatusItem in the system menubar.
 - (id)init;
 
+// Sets the unread count and quiet mode status of the icon.
+- (void)setUnreadCount:(size_t)unreadCount withQuietMode:(BOOL)quietMode;
+
 // Removes the status item from the menubar. Must be called to break the
 // retain cycle between self and the NSStatusItem view.
 - (void)removeItem;