diff -r 000000000000 -r 6474c204b198 editor/libeditor/base/nsIAbsorbingTransaction.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/libeditor/base/nsIAbsorbingTransaction.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,53 @@
+/* -*- 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 nsIAbsorbingTransaction_h__
+#define nsIAbsorbingTransaction_h__
+
+#include "nsISupports.h"
+
+/*
+Transaction interface to outside world
+*/
+
+#define NS_IABSORBINGTRANSACTION_IID \
+{ /* a6cf9116-15b3-11d2-932e-00805f8add32 */ \
+    0xa6cf9116, \
+    0x15b3, \
+    0x11d2, \
+    {0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
+
+class nsSelectionState;
+class nsIEditor;
+class nsIAtom;
+
+/**
+ * A transaction interface mixin - for transactions that can support. 
+ * the placeholder absorbtion idiom. 
+ */
+class nsIAbsorbingTransaction  : public nsISupports{
+public:
+
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IABSORBINGTRANSACTION_IID)
+
+  NS_IMETHOD Init(nsIAtom* aName, nsSelectionState* aSelState,
+                  nsEditor* aEditor) = 0;
+  
+  NS_IMETHOD EndPlaceHolderBatch()=0;
+  
+  NS_IMETHOD GetTxnName(nsIAtom **aName)=0;
+
+  NS_IMETHOD StartSelectionEquals(nsSelectionState *aSelState, bool *aResult)=0;
+
+  NS_IMETHOD ForwardEndBatchTo(nsIAbsorbingTransaction *aForwardingAddress)=0;
+  
+  NS_IMETHOD Commit()=0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIAbsorbingTransaction,
+                              NS_IABSORBINGTRANSACTION_IID)
+
+#endif // nsIAbsorbingTransaction_h__
+