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diff --git a/postinstall_runner_action.h b/postinstall_runner_action.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 CHROMEOS_PLATFORM_UPDATE_ENGINE_POSTINSTALL_RUNNER_ACTION_H__
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_POSTINSTALL_RUNNER_ACTION_H__
+
+#include <string>
+#include "update_engine/action.h"
+
+// The Postinstall Runner Action is responsible for running the postinstall
+// script of a successfully downloaded update.
+
+namespace chromeos_update_engine {
+
+class PostinstallRunnerAction;
+class NoneType;
+
+template<>
+class ActionTraits<PostinstallRunnerAction> {
+ public:
+  // Takes the device path as input
+  typedef std::string InputObjectType;
+  // Passes the device path as output
+  typedef std::string OutputObjectType;
+};
+
+class PostinstallRunnerAction : public Action<PostinstallRunnerAction> {
+ public:
+  PostinstallRunnerAction() {}
+  typedef ActionTraits<PostinstallRunnerAction>::InputObjectType
+      InputObjectType;
+  typedef ActionTraits<PostinstallRunnerAction>::OutputObjectType
+      OutputObjectType;
+  void PerformAction();
+
+  // This is a synchronous action, and thus TerminateProcessing() should
+  // never be called
+  void TerminateProcessing() { CHECK(false); }
+
+  // Debugging/logging
+  static std::string StaticType() { return "PostinstallRunnerAction"; }
+  std::string Type() const { return StaticType(); }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PostinstallRunnerAction);
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_POSTINSTALL_RUNNER_ACTION_H__