Set up the infrastructure for Extension event metrics.

chrome/browser/chromeos/file_system_provider/service.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/chromeos/file_system_provider/service.h"
 
 #include "base/files/file_path.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/stl_util.h"
@@ skipping 261 matching lines @@
 
   if (!event_router->ExtensionHasEventListener(
           extension_id, extensions::api::file_system_provider::
                             OnMountRequested::kEventName)) {
     return false;
   }
 
   event_router->DispatchEventToExtension(
       extension_id,
       make_scoped_ptr(new extensions::Event(
+          extensions::events::UNKNOWN,
           extensions::api::file_system_provider::OnMountRequested::kEventName,
           scoped_ptr<base::ListValue>(new base::ListValue()))));
 
   return true;
 }
 
 std::vector<ProvidedFileSystemInfo> Service::GetProvidedFileSystemInfoList() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   std::vector<ProvidedFileSystemInfo> result;
@@ skipping 160 matching lines @@
 }
 
 void Service::OnWatcherListChanged(
     const ProvidedFileSystemInfo& file_system_info,
     const Watchers& watchers) {
   registry_->RememberFileSystem(file_system_info, watchers);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos