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diff --git a/chrome/browser/sync/engine/syncer_command.h b/chrome/browser/sync/engine/syncer_command.h
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+++ b/chrome/browser/sync/engine/syncer_command.h
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+// Copyright (c) 2009 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 CHROME_BROWSER_SYNC_ENGINE_SYNCER_COMMAND_H_
+#define CHROME_BROWSER_SYNC_ENGINE_SYNCER_COMMAND_H_
+
+#include "base/basictypes.h"
+
+namespace browser_sync {
+
+class SyncerSession;
+
+// Implementation of a simple command pattern intended to be driven by the
+// Syncer.  SyncerCommand is abstract and all subclasses must
+// implement ExecuteImpl().  This is done so that chunks of syncer operation
+// can be unit tested.
+//
+// Example Usage:
+//
+// SyncerSession session = ...;
+// SyncerCommand *cmd = SomeCommandFactory.createCommand(...);
+// cmd->Execute(session);
+// delete cmd;
+//
+
+class SyncerCommand {
+ public:
+  SyncerCommand();
+  virtual ~SyncerCommand();
+
+  // Execute dispatches to a derived class's ExecuteImpl.
+  void Execute(SyncerSession *session);
+
+  // ExecuteImpl is where derived classes actually do work.
+  virtual void ExecuteImpl(SyncerSession *session) = 0;
+ private:
+  void SendNotifications(SyncerSession *session);
+  DISALLOW_COPY_AND_ASSIGN(SyncerCommand);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_COMMAND_H_