Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/downloads/downloads_api_browsertest.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.
 
 // Disable everything on windows only. http://crbug.com/306144
 #ifndef OS_WIN
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
@@ skipping 160 matching lines @@
     DownloadsNotificationSource;
 
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override {
     switch (type) {
       case extensions::NOTIFICATION_EXTENSION_DOWNLOADS_EVENT: {
           DownloadsNotificationSource* dns =
               content::Source<DownloadsNotificationSource>(source).ptr();
           Event* new_event = new Event(
-              dns->profile,
-              dns->event_name,
+              dns->profile, dns->event_name,
               *content::Details<std::string>(details).ptr(), base::Time::Now());
           events_.push_back(new_event);
           if (waiting_ &&
               waiting_for_.get() &&
               new_event->Satisfies(*waiting_for_)) {
             waiting_ = false;
             base::MessageLoopForUI::current()->Quit();
           }
           break;
         }
@@ skipping 3955 matching lines @@
   EXPECT_EQ(downloads::FILENAME_CONFLICT_ACTION_PROMPT, conflict_action);
   EXPECT_FALSE(warnings.empty());
   EXPECT_EQ(Warning::kDownloadFilenameConflict,
             warnings.begin()->warning_type());
   EXPECT_EQ("incumbent", warnings.begin()->extension_id());
 }
 
 }  // namespace extensions
 
 #endif  // http://crbug.com/3061144