Set up the infrastructure for Extension event metrics.

chrome/browser/notifications/desktop_notification_service.cc

 // Copyright (c) 2012 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/desktop_notification_service.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ skipping 250 matching lines @@
     const NotifierId& notifier_id, bool enabled) {
 #if defined(ENABLE_EXTENSIONS)
   DCHECK_EQ(NotifierId::APPLICATION, notifier_id.type);
   extensions::api::notifications::PermissionLevel permission =
       enabled ? extensions::api::notifications::PERMISSION_LEVEL_GRANTED
               : extensions::api::notifications::PERMISSION_LEVEL_DENIED;
   scoped_ptr<base::ListValue> args(new base::ListValue());
   args->Append(new base::StringValue(
       extensions::api::notifications::ToString(permission)));
   scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::events::UNKNOWN,
       extensions::api::notifications::OnPermissionLevelChanged::kEventName,
       args.Pass()));
   extensions::EventRouter::Get(profile_)
       ->DispatchEventToExtension(notifier_id.id, event.Pass());
 
   // Tell the IO thread that this extension's permission for notifications
   // has changed.
   extensions::InfoMap* extension_info_map =
       extensions::ExtensionSystem::Get(profile_)->info_map();
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&extensions::InfoMap::SetNotificationsDisabled,
                  extension_info_map, notifier_id.id, !enabled));
 #endif
 }