Stats collector for message center.

chrome/browser/notifications/message_center_notification_manager.h

Index: chrome/browser/notifications/message_center_notification_manager.h
diff --git a/chrome/browser/notifications/message_center_notification_manager.h b/chrome/browser/notifications/message_center_notification_manager.h
index 35094ccef2b676b25cf5d6258a2ac14443a9af3b..c124570d8726a2ec1d5fde256d8933abafb6cd4d 100644
--- a/chrome/browser/notifications/message_center_notification_manager.h
+++ b/chrome/browser/notifications/message_center_notification_manager.h
@@ -14,6 +14,7 @@
 #include "base/prefs/pref_member.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "chrome/browser/notifications/message_center_stats_collector.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_system_observer.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
@@ -227,6 +228,9 @@ class MessageCenterNotificationManager
 
   NotificationSystemObserver system_observer_;
 
+  // Keeps track of all notification statistics for UMA purposes.
+  MessageCenterStatsCollector stats_collector_;
+
   DISALLOW_COPY_AND_ASSIGN(MessageCenterNotificationManager);
 };