Issue 1109 - Support notifications

src/engine/NotificationWindow.h

-#pragma once
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NOTIFICATION_WINDOW_H
+#define NOTIFICATION_WINDOW_H
+
 #include <atlbase.h>
 #include <atlwin.h>
 #include <atlctl.h>
 #include <atlimage.h>
 #include <AdblockPlus/JsValue.h>
 #include <AdblockPlus/Notification.h>
 #include <functional>
 #include <MsHtmdid.h>
 
 class IconStaticControl : public ATL::CWindow
@@ skipping 263 matching lines @@
   void OnFinalMessage(HWND) override;
 
   // returns {windowX, windowY} of top left corner on the monitor
   POINT GetWindowCoordinates();
 private:
   // m_content is used as a holder of all children and we need it to have a border.
   // It seems the most correct way to have a border to set WS_POPUPWINDOW style
   // and paint the border in WM_NCPAINT but it simply does not work here.
   NotificationWindow m_content;
   std::function<void()> m_onDestroyedCallback;
-};
+};
+#endif