Set up the infrastructure for Extension event metrics.

chrome/browser/notifications/message_center_settings_controller.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 "chrome/browser/notifications/message_center_settings_controller.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/i18n/string_compare.h"
@@ skipping 384 matching lines @@
   const std::string& extension_id = notifier_id.id;
 
   if (notifier_groups_.size() < current_notifier_group_)
     return;
   Profile* profile = notifier_groups_[current_notifier_group_]->profile();
 
   extensions::EventRouter* event_router = extensions::EventRouter::Get(profile);
   scoped_ptr<base::ListValue> args(new base::ListValue());
 
   scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::events::UNKNOWN,
       extensions::api::notifications::OnShowSettings::kEventName, args.Pass()));
   event_router->DispatchEventToExtension(extension_id, event.Pass());
 }
 
 void MessageCenterSettingsController::OnFaviconLoaded(
     const GURL& url,
     const favicon_base::FaviconImageResult& favicon_result) {
   FOR_EACH_OBSERVER(message_center::NotifierSettingsObserver,
                     observers_,
                     UpdateIconImage(NotifierId(url), favicon_result.image));
@@ skipping 132 matching lines @@
             weak_factory_.GetWeakPtr()));
   }
 #endif
 
   if (notify) {
     FOR_EACH_OBSERVER(message_center::NotifierSettingsObserver,
                       observers_,
                       NotifierGroupChanged());
   }
 }