diff --git a/mozilla/content/base/src/nsTextContentChangeData.cpp b/mozilla/content/base/src/nsTextContentChangeData.cpp
new file mode 100644
index 00000000000..acb2c14984e
--- /dev/null
+++ b/mozilla/content/base/src/nsTextContentChangeData.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation.  Portions created by Netscape are Copyright (C) 1998
+ * Netscape Communications Corporation.  All Rights Reserved.
+ */
+#include "nsTextContentChangeData.h"
+
+// Create a new instance of nsTextContentChangeData with a refcnt of 1
+nsresult
+NS_NewTextContentChangeData(nsTextContentChangeData** aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  nsTextContentChangeData* it = new nsTextContentChangeData();
+  if (!it) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  it->mRefCnt++;
+  *aResult = it;
+  return NS_OK;
+}
+
+nsTextContentChangeData::nsTextContentChangeData()
+  : mType(Insert),
+    mOffset(0),
+    mLength(0),
+    mReplaceLength(0)
+{
+  NS_INIT_REFCNT();
+}
+
+nsTextContentChangeData::~nsTextContentChangeData()
+{
+}
+
+NS_IMPL_ISUPPORTS1(nsTextContentChangeData, nsITextContentChangeData);
+
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetChangeType(ChangeType* aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = mType;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetReplaceData(PRInt32* aOffset,
+                                        PRInt32* aSourceLength,
+                                        PRInt32* aReplaceLength)
+{
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aSourceLength);
+  NS_ENSURE_ARG_POINTER(aReplaceLength);
+  *aOffset = mOffset;
+  *aSourceLength = mLength;
+  *aReplaceLength = mReplaceLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetInsertData(PRInt32* aOffset,
+                                       PRInt32* aInsertLength)
+{
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aInsertLength);
+  *aOffset = mOffset;
+  *aInsertLength = mLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetAppendData(PRInt32* aOffset,
+                                       PRInt32* aAppendLength)
+{
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aAppendLength);
+  *aOffset = mOffset;
+  *aAppendLength = mLength;
+  return NS_OK;
+}
diff --git a/mozilla/content/base/src/nsTextContentChangeData.h b/mozilla/content/base/src/nsTextContentChangeData.h
new file mode 100644
index 00000000000..f94c6aa44f6
--- /dev/null
+++ b/mozilla/content/base/src/nsTextContentChangeData.h
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation.  Portions created by Netscape are Copyright (C) 1998
+ * Netscape Communications Corporation.  All Rights Reserved.
+ */
+#ifndef nsTextContentChangeData_h___
+#define nsTextContentChangeData_h___
+
+#include "nsITextContent.h"
+
+class nsTextContentChangeData : public nsITextContentChangeData {
+public:
+  friend nsresult
+    NS_NewTextContentChangeData(nsTextContentChangeData** aResult);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS
+
+  // nsITextContentChangedData
+  NS_IMETHOD GetChangeType(ChangeType* aResult);
+
+  NS_IMETHOD GetReplaceData(PRInt32* aOffset,
+                            PRInt32* aSourceLength,
+                            PRInt32* aReplaceLength);
+
+  NS_IMETHOD GetInsertData(PRInt32* aOffset,
+                           PRInt32* aInsertLength);
+
+  NS_IMETHOD GetAppendData(PRInt32* aOffset,
+                           PRInt32* aAppendLength);
+
+  void SetData(ChangeType aType, PRInt32 aOffset, PRInt32 aLength) {
+    mType = aType;
+    mOffset = aOffset;
+    mLength = aLength;
+  }
+
+  void SetReplaceLength(PRInt32 aReplaceLength) {
+    mReplaceLength = aReplaceLength;
+  }
+
+protected:
+  nsTextContentChangeData();
+  virtual ~nsTextContentChangeData();
+
+  ChangeType mType;
+  PRInt32 mOffset;
+  PRInt32 mLength;
+  PRInt32 mReplaceLength;               // only used for replace type
+};
+
+// Create a new instance of nsTextContentChangeData with a refcnt of 1
+extern nsresult
+NS_NewTextContentChangeData(nsTextContentChangeData** aResult);
+
+#endif /* nsTextContentChangeData_h___ */
diff --git a/mozilla/layout/base/src/nsTextContentChangeData.cpp b/mozilla/layout/base/src/nsTextContentChangeData.cpp
new file mode 100644
index 00000000000..acb2c14984e
--- /dev/null
+++ b/mozilla/layout/base/src/nsTextContentChangeData.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation.  Portions created by Netscape are Copyright (C) 1998
+ * Netscape Communications Corporation.  All Rights Reserved.
+ */
+#include "nsTextContentChangeData.h"
+
+// Create a new instance of nsTextContentChangeData with a refcnt of 1
+nsresult
+NS_NewTextContentChangeData(nsTextContentChangeData** aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  nsTextContentChangeData* it = new nsTextContentChangeData();
+  if (!it) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  it->mRefCnt++;
+  *aResult = it;
+  return NS_OK;
+}
+
+nsTextContentChangeData::nsTextContentChangeData()
+  : mType(Insert),
+    mOffset(0),
+    mLength(0),
+    mReplaceLength(0)
+{
+  NS_INIT_REFCNT();
+}
+
+nsTextContentChangeData::~nsTextContentChangeData()
+{
+}
+
+NS_IMPL_ISUPPORTS1(nsTextContentChangeData, nsITextContentChangeData);
+
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetChangeType(ChangeType* aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = mType;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetReplaceData(PRInt32* aOffset,
+                                        PRInt32* aSourceLength,
+                                        PRInt32* aReplaceLength)
+{
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aSourceLength);
+  NS_ENSURE_ARG_POINTER(aReplaceLength);
+  *aOffset = mOffset;
+  *aSourceLength = mLength;
+  *aReplaceLength = mReplaceLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetInsertData(PRInt32* aOffset,
+                                       PRInt32* aInsertLength)
+{
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aInsertLength);
+  *aOffset = mOffset;
+  *aInsertLength = mLength;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTextContentChangeData::GetAppendData(PRInt32* aOffset,
+                                       PRInt32* aAppendLength)
+{
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aAppendLength);
+  *aOffset = mOffset;
+  *aAppendLength = mLength;
+  return NS_OK;
+}
diff --git a/mozilla/layout/base/src/nsTextContentChangeData.h b/mozilla/layout/base/src/nsTextContentChangeData.h
new file mode 100644
index 00000000000..f94c6aa44f6
--- /dev/null
+++ b/mozilla/layout/base/src/nsTextContentChangeData.h
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation.  Portions created by Netscape are Copyright (C) 1998
+ * Netscape Communications Corporation.  All Rights Reserved.
+ */
+#ifndef nsTextContentChangeData_h___
+#define nsTextContentChangeData_h___
+
+#include "nsITextContent.h"
+
+class nsTextContentChangeData : public nsITextContentChangeData {
+public:
+  friend nsresult
+    NS_NewTextContentChangeData(nsTextContentChangeData** aResult);
+
+  // nsISupports
+  NS_DECL_ISUPPORTS
+
+  // nsITextContentChangedData
+  NS_IMETHOD GetChangeType(ChangeType* aResult);
+
+  NS_IMETHOD GetReplaceData(PRInt32* aOffset,
+                            PRInt32* aSourceLength,
+                            PRInt32* aReplaceLength);
+
+  NS_IMETHOD GetInsertData(PRInt32* aOffset,
+                           PRInt32* aInsertLength);
+
+  NS_IMETHOD GetAppendData(PRInt32* aOffset,
+                           PRInt32* aAppendLength);
+
+  void SetData(ChangeType aType, PRInt32 aOffset, PRInt32 aLength) {
+    mType = aType;
+    mOffset = aOffset;
+    mLength = aLength;
+  }
+
+  void SetReplaceLength(PRInt32 aReplaceLength) {
+    mReplaceLength = aReplaceLength;
+  }
+
+protected:
+  nsTextContentChangeData();
+  virtual ~nsTextContentChangeData();
+
+  ChangeType mType;
+  PRInt32 mOffset;
+  PRInt32 mLength;
+  PRInt32 mReplaceLength;               // only used for replace type
+};
+
+// Create a new instance of nsTextContentChangeData with a refcnt of 1
+extern nsresult
+NS_NewTextContentChangeData(nsTextContentChangeData** aResult);
+
+#endif /* nsTextContentChangeData_h___ */