Set up the infrastructure for Extension event metrics.

extensions/browser/api/networking_config/networking_config_service.cc

 // Copyright 2015 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 <algorithm>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 179 matching lines @@
   std::string hex_ssid =
       base::HexEncode(vector_as_array(&raw_ssid), raw_ssid.size());
   network_info.hex_ssid = make_scoped_ptr(new std::string(hex_ssid));
   network_info.ssid = make_scoped_ptr(new std::string(network->name()));
   network_info.guid = make_scoped_ptr(new std::string(network->guid()));
   if (bssid)
     network_info.bssid.reset(new std::string(*bssid));
   scoped_ptr<base::ListValue> results =
       extensions::core_api::networking_config::OnCaptivePortalDetected::Create(
           network_info);
-  scoped_ptr<Event> event(new Event(extensions::core_api::networking_config::
+  scoped_ptr<Event> event(new Event(events::UNKNOWN,
+                                    extensions::core_api::networking_config::
                                         OnCaptivePortalDetected::kEventName,
                                     results.Pass()));
   return event.Pass();
 }
 
 void NetworkingConfigService::DispatchPortalDetectedEvent(
     const std::string& extension_id,
     const std::string& guid,
     const base::Closure& authentication_callback) {
   // This dispatch starts a new cycle of portal detection and authentication.
@@ skipping 10 matching lines @@
 
   network_handler->managed_network_configuration_handler()->GetProperties(
       service_path, base::Bind(&NetworkingConfigService::OnGotProperties,
                                weak_factory_.GetWeakPtr(), extension_id, guid,
                                authentication_callback),
       base::Bind(&NetworkingConfigService::OnGetPropertiesFailed,
                  weak_factory_.GetWeakPtr(), extension_id, guid));
 }
 
 }  // namespace extensions