diff -r 000000000000 -r 6474c204b198 dom/plugins/base/nsPluginNativeWindow.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/plugins/base/nsPluginNativeWindow.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _nsPluginNativeWindow_h_
+#define _nsPluginNativeWindow_h_
+
+#include "nscore.h"
+#include "nsAutoPtr.h"
+#include "nsCOMPtr.h"
+#include "nsISupportsImpl.h"
+#include "nsNPAPIPluginInstance.h"
+#include "npapi.h"
+#include "nsIWidget.h"
+
+/**
+ * base class for native plugin window implementations
+ */
+class nsPluginNativeWindow : public NPWindow
+{
+public: 
+  nsPluginNativeWindow() : NPWindow() {
+    MOZ_COUNT_CTOR(nsPluginNativeWindow);
+  }
+
+  virtual ~nsPluginNativeWindow() {
+    MOZ_COUNT_DTOR(nsPluginNativeWindow);
+  }
+
+  /**
+   *   !!! CAUTION !!!
+   *
+   * The base class |nsPluginWindow| is defined as a struct in nsplugindefs.h,
+   * thus it does not have a destructor of its own.
+   * One should never attempt to delete |nsPluginNativeWindow| object instance
+   * (or derivatives) using a pointer of |nsPluginWindow *| type. Should such
+   * necessity occur it must be properly casted first.
+   */
+
+public:
+  nsresult GetPluginInstance(nsRefPtr<nsNPAPIPluginInstance> &aPluginInstance) { 
+    aPluginInstance = mPluginInstance;
+    return NS_OK;
+  }
+  nsresult SetPluginInstance(nsNPAPIPluginInstance *aPluginInstance) { 
+    if (mPluginInstance != aPluginInstance)
+      mPluginInstance = aPluginInstance;
+    return NS_OK;
+  }
+
+  nsresult GetPluginWidget(nsIWidget **aWidget) {
+    NS_IF_ADDREF(*aWidget = mWidget);
+    return NS_OK;
+  }
+  nsresult SetPluginWidget(nsIWidget *aWidget) { 
+    mWidget = aWidget;
+    return NS_OK;
+  }
+
+public:
+  virtual nsresult CallSetWindow(nsRefPtr<nsNPAPIPluginInstance> &aPluginInstance) {
+    // null aPluginInstance means that we want to call SetWindow(null)
+    if (aPluginInstance)
+      aPluginInstance->SetWindow(this);
+    else if (mPluginInstance)
+      mPluginInstance->SetWindow(nullptr);
+
+    SetPluginInstance(aPluginInstance);
+    return NS_OK;
+  }
+
+protected:
+  nsRefPtr<nsNPAPIPluginInstance> mPluginInstance;
+  nsCOMPtr<nsIWidget> mWidget;
+};
+
+nsresult PLUG_NewPluginNativeWindow(nsPluginNativeWindow ** aPluginNativeWindow);
+nsresult PLUG_DeletePluginNativeWindow(nsPluginNativeWindow * aPluginNativeWindow);
+
+#endif //_nsPluginNativeWindow_h_