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diff --git a/sync/internal_api/base_transaction.h b/sync/internal_api/base_transaction.h
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+++ b/sync/internal_api/base_transaction.h
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SYNC_INTERNAL_API_BASE_TRANSACTION_H_
+#define SYNC_INTERNAL_API_BASE_TRANSACTION_H_
+#pragma once
+
+#include "sync/internal_api/user_share.h"
+
+#include "sync/util/cryptographer.h"
+
+namespace syncable {
+class BaseTransaction;
+class Directory;
+}
+
+namespace sync_api {
+
+// Sync API's BaseTransaction, ReadTransaction, and WriteTransaction allow for
+// batching of several read and/or write operations.  The read and write
+// operations are performed by creating ReadNode and WriteNode instances using
+// the transaction. These transaction classes wrap identically named classes in
+// syncable, and are used in a similar way. Unlike syncable::BaseTransaction,
+// whose construction requires an explicit syncable::Directory, a sync
+// API BaseTransaction is created from a UserShare object.
+class BaseTransaction {
+ public:
+  // Provide access to the underlying syncable.h objects from BaseNode.
+  virtual syncable::BaseTransaction* GetWrappedTrans() const = 0;
+  browser_sync::Cryptographer* GetCryptographer() const;
+
+  syncable::Directory* GetDirectory() const {
+    return directory_;
+  }
+
+ protected:
+  explicit BaseTransaction(UserShare* share);
+  virtual ~BaseTransaction();
+
+  BaseTransaction() : directory_(NULL) { }
+
+ private:
+  syncable::Directory* directory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
+};
+
+syncable::ModelTypeSet GetEncryptedTypes(
+    const sync_api::BaseTransaction* trans);
+
+}  // namespace sync_api
+
+#endif  // SYNC_INTERNAL_API_BASE_TRANSACTION_H_