Fix the settings button and UMA metrics for the message center

ui/message_center/message_center_tray.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_tray.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/observer_list.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 217 matching lines @@
     OnMessageCenterChanged();
 }
 
 void MessageCenterTray::OnNotificationButtonClicked(
     const std::string& notification_id,
     int button_index) {
   if (popups_visible_)
     OnMessageCenterChanged();
 }
 
+void MessageCenterTray::OnNotificationSettingsClicked(bool handled) {
+  if (!handled)
+    ShowNotifierSettingsBubble();
+}
+
 void MessageCenterTray::OnNotificationDisplayed(
     const std::string& notification_id,
     const DisplaySource source) {
   NotifyMessageCenterTrayChanged();
 }
 
 void MessageCenterTray::OnQuietModeChanged(bool in_quiet_mode) {
   NotifyMessageCenterTrayChanged();
 }
 
@@ skipping 11 matching lines @@
     ShowPopupBubble();
 
   NotifyMessageCenterTrayChanged();
 }
 
 void MessageCenterTray::NotifyMessageCenterTrayChanged() {
   delegate_->OnMessageCenterTrayChanged();
 }
 
 }  // namespace message_center