Set up the infrastructure for Extension event metrics.

chrome/browser/chromeos/printer_detector/printer_detector.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 "chrome/browser/chromeos/printer_detector/printer_detector.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 153 matching lines @@
                               PRINTER_SERVICE_EVENT_MAX);
     webstore_widget_private_api::Options options;
     options.type = webstore_widget_private_api::TYPE_PRINTER_PROVIDER;
     options.usb_id.reset(new webstore_widget_private_api::UsbId());
     options.usb_id->vendor_id = vendor_id_;
     options.usb_id->product_id = product_id_;
 
     extensions::EventRouter* event_router =
         extensions::EventRouter::Get(browser_context_);
     scoped_ptr<extensions::Event> event(new extensions::Event(
+        extensions::events::UNKNOWN,
         webstore_widget_private_api::OnShowWidget::kEventName,
         webstore_widget_private_api::OnShowWidget::Create(options)));
     event_router->DispatchEventToExtension(extension_misc::kWebstoreWidgetAppId,
                                            event.Pass());
   }
 
  private:
   ~SearchPrinterAppNotificationDelegate() override = default;
 
   content::BrowserContext* browser_context_;
@@ skipping 109 matching lines @@
                                : g_browser_process->notification_ui_manager(),
       device);
 }
 
 void PrinterDetector::SetNotificationUIManagerForTesting(
     NotificationUIManager* manager) {
   notification_ui_manager_ = manager;
 }
 
 }  // namespace chromeos