Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/extension_messages_apitest.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 "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 50 matching lines @@
     event->SetBoolean("lastMessage", last_message);
     event->SetString("data", data);
     scoped_ptr<base::ListValue> arguments(new base::ListValue());
     arguments->Append(event);
     return arguments.Pass();
   }
 
   static scoped_ptr<Event> BuildEvent(scoped_ptr<base::ListValue> event_args,
                                       Profile* profile,
                                       GURL event_url) {
-    scoped_ptr<Event> event(new Event("test.onMessage", event_args.Pass()));
+    scoped_ptr<Event> event(
+        new Event(events::UNKNOWN, "test.onMessage", event_args.Pass()));
     event->restrict_to_browser_context = profile;
     event->event_url = event_url;
     return event.Pass();
   }
 
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override {
     DCHECK_EQ(extensions::NOTIFICATION_EXTENSION_HOST_DID_STOP_FIRST_LOAD,
               type);
@@ skipping 1112 matching lines @@
   ui_test_utils::NavigateToURL(browser(), chromium_org_url());
   EXPECT_EQ(COULD_NOT_ESTABLISH_CONNECTION_ERROR,
             CanConnectAndSendMessagesToMainFrame(invalid.get()));
 }
 
 #endif  // !defined(OS_WIN) - http://crbug.com/350517.
 
 }  // namespace
 
 };  // namespace extensions