Fix the settings button and UMA metrics for the message center

ui/message_center/message_center_impl.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/message_center/message_center_impl.h"
 
 #include <algorithm>
 #include <deque>
 #include <memory>
 #include <utility>
@@ skipping 777 matching lines @@
       notification_list_->GetNotificationDelegate(id);
   if (delegate.get())
     delegate->ButtonClick(button_index);
   for (auto& observer : observer_list_)
     observer.OnNotificationButtonClicked(id, button_index);
 }
 
 void MessageCenterImpl::ClickOnSettingsButton(const std::string& id) {
   scoped_refptr<NotificationDelegate> delegate =
       notification_list_->GetNotificationDelegate(id);
+
+  bool handled_by_delegate = false;
   if (delegate.get())
-    delegate->SettingsClick();
+    handled_by_delegate = delegate->SettingsClick();
+
   for (auto& observer : observer_list_)
-    observer.OnNotificationSettingsClicked();
+    observer.OnNotificationSettingsClicked(handled_by_delegate);
 }
 
 void MessageCenterImpl::MarkSinglePopupAsShown(const std::string& id,
                                                bool mark_notification_as_read) {
   if (FindVisibleNotificationById(id) == NULL)
     return;
 #if !defined(OS_CHROMEOS)
   return this->RemoveNotification(id, false);
 #else
   notification_list_->MarkSinglePopupAsShown(id, mark_notification_as_read);
@@ skipping 87 matching lines @@
 }
 
 void MessageCenterImpl::EnableChangeQueueForTest(bool enable) {
   if (enable)
     notification_queue_.reset(new internal::ChangeQueue());
   else
     notification_queue_.reset();
 }
 
 }  // namespace message_center