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diff --git a/chrome/browser/automation/automation_provider_json.h b/chrome/browser/automation/automation_provider_json.h
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+++ b/chrome/browser/automation/automation_provider_json.h
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+// Copyright (c) 2010 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.
+
+// Support utilities for the JSON automation interface used by PyAuto.
+
+#ifndef CHROME_BROWSER_AUTOMATION_AUTOMATION_PROVIDER_JSON_H_
+#define CHROME_BROWSER_AUTOMATION_AUTOMATION_PROVIDER_JSON_H_
+
+#include <string>
+
+#include "base/values.h"
+#include "ipc/ipc_message.h"
+#include "chrome/browser/automation/automation_provider.h"
+
+// Helper to ensure we always send a reply message for JSON automation requests.
+class AutomationJSONReply {
+ public:
+  // Creates a new reply object for the IPC message |reply_message| for
+  // |provider|. The caller is expected to call SendSuccess() or SendError()
+  // before destroying this object.
+  AutomationJSONReply(AutomationProvider* provider,
+                      IPC::Message* reply_message);
+
+  ~AutomationJSONReply();
+
+  // Send a success reply along with data contained in |value|.
+  // An empty message will be sent if |value| is NULL.
+  void SendSuccess(const Value* value);
+
+  // Send an error reply along with error message |error_message|.
+  void SendError(const std::string& error_message);
+
+ private:
+  AutomationProvider* provider_;
+  IPC::Message* message_;
+};
+
+#endif  // CHROME_BROWSER_AUTOMATION_AUTOMATION_PROVIDER_JSON_H_
+