Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/bookmarks/bookmarks_api.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 "chrome/browser/extensions/api/bookmarks/bookmarks_api.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/i18n/time_formatting.h"
@@ skipping 240 matching lines @@
   if (model_) {
     model_->RemoveObserver(this);
   }
 }
 
 void BookmarkEventRouter::DispatchEvent(
     const std::string& event_name,
     scoped_ptr<base::ListValue> event_args) {
   EventRouter* event_router = EventRouter::Get(browser_context_);
   if (event_router) {
-    event_router->BroadcastEvent(
-        make_scoped_ptr(new extensions::Event(event_name, event_args.Pass())));
+    event_router->BroadcastEvent(make_scoped_ptr(new extensions::Event(
+        extensions::events::UNKNOWN, event_name, event_args.Pass())));
   }
 }
 
 void BookmarkEventRouter::BookmarkModelLoaded(BookmarkModel* model,
                                               bool ids_reassigned) {
   // TODO(erikkay): Perhaps we should send this event down to the extension
   // so they know when it's safe to use the API?
 }
 
 void BookmarkEventRouter::BookmarkModelBeingDeleted(BookmarkModel* model) {
@@ skipping 570 matching lines @@
 }
 
 void BookmarksExportFunction::FileSelected(const base::FilePath& path,
                                            int index,
                                            void* params) {
   bookmark_html_writer::WriteBookmarks(GetProfile(), path, NULL);
   Release();  // Balanced in BookmarksIOFunction::SelectFile()
 }
 
 }  // namespace extensions