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diff --git a/chrome/browser/utility_process_host.h b/chrome/browser/utility_process_host.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_UTILITY_PROCESS_HOST_H_
+#define CHROME_BROWSER_UTILITY_PROCESS_HOST_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/ref_counted.h"
+#include "base/task.h"
+#include "chrome/common/child_process_host.h"
+#include "chrome/common/ipc_channel.h"
+
+class CommandLine;
+class MessageLoop;
+
+// This class acts as the browser-side host to a utility child process.  A
+// utility process is a short-lived sandboxed process that is created to run
+// a specific task.  This class lives solely on the IO thread.
+class UtilityProcessHost : public ChildProcessHost {
+ public:
+  // An interface to be implemented by consumers of the utility process to
+  // get results back.  All functions are called on the thread passed along
+  // to UtilityProcessHost.
+  class Client : public base::RefCountedThreadSafe<Client> {
+   public:
+    Client() {}
+    virtual ~Client() {}
+
+    // Called when the process has crashed.
+    virtual void OnProcessCrashed() {}
+
+    // Called when the process sends a reply to an UnpackExtension message.
+    // If success if false, error_message contains a description of the problem.
+    virtual void OnUnpackExtensionReply(bool success,
+                                        const std::string& error_message) {}
+   private:
+    friend class UtilityProcessHost;
+    void OnMessageReceived(const IPC::Message& message);
+
+    DISALLOW_COPY_AND_ASSIGN(Client);
+  };
+
+  UtilityProcessHost(ResourceDispatcherHost* rdh, Client* client,
+                     MessageLoop* client_loop);
+  ~UtilityProcessHost();
+
+  // Start a process to unpack the extension at the given path.  The process
+  // will be given access to the directory subtree that the extension file is
+  // in, so the caller is expected to have moved that file into a quarantined
+  // location first.
+  bool StartExtensionUnpacker(const FilePath& extension);
+
+ private:
+  // Starts the process.  Returns true iff it succeeded.
+  bool StartProcess(const FilePath& exposed_dir);
+
+  // IPC messages:
+  void OnMessageReceived(const IPC::Message& message);
+
+  // ChildProcessHost:
+  virtual void OnChannelError();
+  virtual bool CanShutdown() { return true; }
+  virtual URLRequestContext* GetRequestContext(
+      uint32 request_id,
+      const ViewHostMsg_Resource_Request& request_data) {
+    return NULL;
+  }
+
+  // A pointer to our client interface, who will be informed of progress.
+  scoped_refptr<Client> client_;
+  MessageLoop* client_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(UtilityProcessHost);
+};
+
+#endif  // CHROME_BROWSER_UTILITY_PROCESS_HOST_H_