Mac: Added a delay before panels go to minimized state from title-only state.

chrome/common/chrome_notification_types.h

Index: chrome/common/chrome_notification_types.h
diff --git a/chrome/common/chrome_notification_types.h b/chrome/common/chrome_notification_types.h
index 92163b62760ab0d8053cafe810564812c5723607..9d1865cf53bad0393ba2a5ef2b10f9de3d3aa1e7 100644
--- a/chrome/common/chrome_notification_types.h
+++ b/chrome/common/chrome_notification_types.h
@@ -943,6 +943,11 @@ enum NotificationType {
   // Used only in unit testing.
   NOTIFICATION_PANEL_CHANGED_ACTIVE_STATUS,
 
+  // Sent when panel is minimized/restored/shows title only etc.
+  // The source is the Panel, no details.
+  // Used only in unit testing.
+  NOTIFICATION_PANEL_CHANGED_EXPANSION_STATE,
+
   // Sent when panel window size is known. This is for platforms where the
   // window creation is async and size of the window only becomes known later.
   // Used only in unit testing.