Added UMA stats for extensions events on addListener.

chrome/browser/extensions/api/tab_capture/tab_capture_registry.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/tab_capture/tab_capture_registry.h"
 
 #include <utility>
 
 #include "content/public/browser/browser_thread.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 
-namespace events = extensions::event_names;
 using content::BrowserThread;
 
 namespace extensions {
 
 TabCaptureRegistry::TabCaptureRequest::TabCaptureRequest(
     const std::string& extension_id, const int tab_id,
     tab_capture::TabCaptureState status)
     : extension_id(extension_id), tab_id(tab_id), status(status),
       last_status(status) {
 }
@@ skipping 132 matching lines @@
   scoped_ptr<tab_capture::CaptureInfo> info(new tab_capture::CaptureInfo());
   info->tab_id = request_info->tab_id;
   info->status = request_info->status;
 
   // We will get duplicate events if we requested both audio and video, so only
   // send new events.
   if (request_info->last_status != request_info->status) {
     scoped_ptr<base::ListValue> args(new ListValue());
     args->Append(info->ToValue().release());
     scoped_ptr<Event> event(new Event(
-        events::kOnTabCaptureStatusChanged, args.Pass()));
+        event_names::kOnTabCaptureStatusChanged, args.Pass()));
     event->restrict_to_profile = profile_;
     router->DispatchEventToExtension(request_info->extension_id, event.Pass());
   }
 }
 
 }  // namespace extensions