diff -r 000000000000 -r 6474c204b198 layout/generic/nsAutoCopyListener.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/generic/nsAutoCopyListener.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 nsAutoCopyListener_h_
+#define nsAutoCopyListener_h_
+
+#include "nsISelectionListener.h"
+#include "nsISelectionPrivate.h"
+#include "mozilla/Attributes.h"
+
+class nsAutoCopyListener MOZ_FINAL : public nsISelectionListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISELECTIONLISTENER
+
+  void Listen(nsISelectionPrivate *aSelection)
+  {
+      NS_ASSERTION(aSelection, "Null selection passed to Listen()");
+      aSelection->AddSelectionListener(this);
+  }
+
+  static nsAutoCopyListener* GetInstance()
+  {
+    if (!sInstance) {
+      sInstance = new nsAutoCopyListener();
+
+      NS_ADDREF(sInstance);
+    }
+
+    return sInstance;
+  }
+
+  static void Shutdown()
+  {
+    NS_IF_RELEASE(sInstance);
+  }
+
+private:
+  static nsAutoCopyListener* sInstance;
+};
+
+#endif