diff -r 000000000000 -r 6474c204b198 editor/libeditor/base/EditTxn.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/libeditor/base/EditTxn.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* -*- 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 EditTxn_h__
+#define EditTxn_h__
+
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupportsImpl.h"
+#include "nsITransaction.h"
+#include "nsPIEditorTransaction.h"
+#include "nscore.h"
+
+/**
+ * Base class for all document editing transactions.
+ */
+class EditTxn : public nsITransaction,
+                public nsPIEditorTransaction
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(EditTxn, nsITransaction)
+
+  virtual ~EditTxn();
+
+  virtual void LastRelease() {}
+
+  NS_IMETHOD RedoTransaction(void);
+  NS_IMETHOD GetIsTransient(bool *aIsTransient);
+  NS_IMETHOD Merge(nsITransaction *aTransaction, bool *aDidMerge);
+};
+
+#define NS_DECL_EDITTXN \
+  NS_IMETHOD DoTransaction(); \
+  NS_IMETHOD UndoTransaction(); \
+  NS_IMETHOD GetTxnDescription(nsAString& aTxnDescription);
+
+#endif