Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/hotword_private/hotword_private_api.cc

 // Copyright 2014 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/extensions/api/hotword_private/hotword_private_api.h"
 
 #include <string>
 
 #include "base/lazy_instance.h"
 #include "base/prefs/pref_service.h"
@@ skipping 103 matching lines @@
 void HotwordPrivateEventService::SignalEvent(const std::string& event_name) {
   SignalEvent(event_name, make_scoped_ptr(new base::ListValue()));
 }
 
 void HotwordPrivateEventService::SignalEvent(const std::string& event_name,
                                              scoped_ptr<base::ListValue> args) {
   EventRouter* router = EventRouter::Get(profile_);
   if (!router || !router->HasEventListener(event_name))
     return;
 
-  scoped_ptr<Event> event(new Event(event_name, args.Pass()));
+  scoped_ptr<Event> event(new Event(events::UNKNOWN, event_name, args.Pass()));
   router->BroadcastEvent(event.Pass());
 }
 
 bool HotwordPrivateSetEnabledFunction::RunSync() {
   scoped_ptr<api::hotword_private::SetEnabled::Params> params(
       api::hotword_private::SetEnabled::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   PrefService* prefs = GetProfile()->GetPrefs();
   prefs->SetBoolean(prefs::kHotwordSearchEnabled, params->state);
@@ skipping 348 matching lines @@
   HotwordService* hotword_service =
       HotwordServiceFactory::GetForProfile(GetProfile());
   if (!hotword_service)
     return false;
 
   hotword_service->SpeakerModelExistsComplete(params->exists);
   return true;
 }
 
 }  // namespace extensions