Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/history/history_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/history/history_api.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 156 matching lines @@
   DispatchEvent(profile_, api::history::OnVisitRemoved::kEventName,
                 args.Pass());
 }
 
 void HistoryEventRouter::DispatchEvent(
     Profile* profile,
     const std::string& event_name,
     scoped_ptr<base::ListValue> event_args) {
   if (profile && extensions::EventRouter::Get(profile)) {
     scoped_ptr<extensions::Event> event(new extensions::Event(
-        event_name, event_args.Pass()));
+        extensions::events::UNKNOWN, event_name, event_args.Pass()));
     event->restrict_to_browser_context = profile;
     extensions::EventRouter::Get(profile)->BroadcastEvent(event.Pass());
   }
 }
 
 HistoryAPI::HistoryAPI(content::BrowserContext* context)
     : browser_context_(context) {
   EventRouter* event_router = EventRouter::Get(browser_context_);
   event_router->RegisterObserver(this, api::history::OnVisited::kEventName);
   event_router->RegisterObserver(this,
@@ skipping 269 matching lines @@
   }
 
   return true;
 }
 
 void HistoryDeleteAllFunction::DeleteComplete() {
   SendAsyncResponse();
 }
 
 }  // namespace extensions