Fixes the context menu for a notification.

chrome/browser/ui/views/message_center/web_notification_tray.cc

 // Copyright 2013 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/ui/views/message_center/web_notification_tray.h"
 
 #include "base/i18n/number_formatting.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 173 matching lines @@
   }
   message_center_delegate_ =
       new MessageCenterWidgetDelegate(this,
                                       message_center_tray_.get(),
                                       true,  // settings initally visible
                                       GetPositionInfo());
 
   return true;
 }
 
+bool WebNotificationTray::IsContextMenuEnabled() const {
+  // It can always return true because the notifications are invisible if
+  // the context menu shouldn't be enabled, such as in the lock screen.
+  return true;
+}
+
 void WebNotificationTray::OnMessageCenterTrayChanged() {
   if (status_icon_) {
     bool quiet_mode_state = message_center()->IsQuietMode();
     if (last_quiet_mode_state_ != quiet_mode_state) {
       last_quiet_mode_state_ = quiet_mode_state;
 
       // Quiet mode has changed, update the quiet mode menu.
       status_icon_menu_->SetCommandIdChecked(kToggleQuietMode,
                                              quiet_mode_state);
     }
@@ skipping 160 matching lines @@
   status_icon_menu_ = menu.get();
   status_icon->SetContextMenu(menu.Pass());
 }
 
 MessageCenterWidgetDelegate*
 WebNotificationTray::GetMessageCenterWidgetDelegateForTest() {
   return message_center_delegate_;
 }
 
 }  // namespace message_center