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diff --git a/python/google/protobuf/pyext/extension_dict.h b/python/google/protobuf/pyext/extension_dict.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: anuraag@google.com (Anuraag Agrawal)
+// Author: tibell@google.com (Johan Tibell)
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
+
+#include <Python.h>
+
+#include <memory>
+#ifndef _SHARED_PTR_H
+#include <google/protobuf/stubs/shared_ptr.h>
+#endif
+
+
+namespace google {
+namespace protobuf {
+
+class Message;
+class FieldDescriptor;
+
+using internal::shared_ptr;
+
+namespace python {
+
+struct CMessage;
+struct CFieldDescriptor;
+
+typedef struct ExtensionDict {
+  PyObject_HEAD;
+  shared_ptr<Message> owner;
+  CMessage* parent;
+  Message* message;
+  PyObject* values;
+} ExtensionDict;
+
+extern PyTypeObject ExtensionDict_Type;
+
+namespace extension_dict {
+
+// Gets the _cdescriptor reference to a CFieldDescriptor object given a
+// python descriptor object.
+//
+// Returns a new reference.
+CFieldDescriptor* InternalGetCDescriptorFromExtension(PyObject* extension);
+
+// Gets the number of extension values in this ExtensionDict as a python object.
+//
+// Returns a new reference.
+PyObject* len(ExtensionDict* self);
+
+// Releases extensions referenced outside this dictionary to keep outside
+// references alive.
+//
+// Returns 0 on success, -1 on failure.
+int ReleaseExtension(ExtensionDict* self,
+                     PyObject* extension,
+                     const google::protobuf::FieldDescriptor* descriptor);
+
+// Gets an extension from the dict for the given extension descriptor.
+//
+// Returns a new reference.
+PyObject* subscript(ExtensionDict* self, PyObject* key);
+
+// Assigns a value to an extension in the dict. Can only be used for singular
+// simple types.
+//
+// Returns 0 on success, -1 on failure.
+int ass_subscript(ExtensionDict* self, PyObject* key, PyObject* value);
+
+// Clears an extension from the dict. Will release the extension if there
+// is still an external reference left to it.
+//
+// Returns None on success.
+PyObject* ClearExtension(ExtensionDict* self,
+                                       PyObject* extension);
+
+// Checks if the dict has an extension.
+//
+// Returns a new python boolean reference.
+PyObject* HasExtension(ExtensionDict* self, PyObject* extension);
+
+// Gets an extension from the dict given the extension name as opposed to
+// descriptor.
+//
+// Returns a new reference.
+PyObject* _FindExtensionByName(ExtensionDict* self, PyObject* name);
+
+}  // namespace extension_dict
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__