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diff --git a/ui/viewer/viewer_process.h b/ui/viewer/viewer_process.h
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+++ b/ui/viewer/viewer_process.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 UI_VIEWER_VIEWER_PROCESS_H_
+#define UI_VIEWER_VIEWER_PROCESS_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop_proxy.h"
+#include "base/synchronization/waitable_event.h"
+#include "base/threading/thread.h"
+
+class CommandLine;
+class ViewerHostWin;
+class ViewerIPCServer;
+
+// The ViewerProcess does not inherit from ChildProcess because this
+// process can live independently of the browser process.
+class ViewerProcess {
+ public:
+  ViewerProcess();
+  virtual ~ViewerProcess();
+
+  // Initialize the ViewerProcess with the message loop that it should run on.
+  // ViewerProcess takes ownership of |state|.
+  bool Initialize(MessageLoop* message_loop, const CommandLine& command_line);
+
+  bool Teardown();
+
+  // Returns the message loop that we perform I/O coordination on (network
+  // requests, communication with renderers, etc.).
+  scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy() {
+    return io_thread_->message_loop_proxy();
+  }
+
+  // A global event object that is signalled when the main thread's message
+  // loop exits. This gives background threads a way to observe the main
+  // thread shutting down.
+  base::WaitableEvent* shutdown_event() {
+    return &shutdown_event_;
+  }
+
+  // Called by the IPC server when a client disconnects. A return value of
+  // true indicates that the IPC server should continue listening for new
+  // connections.
+  bool HandleClientDisconnect();
+
+  void Terminate();
+
+ private:
+  scoped_ptr<base::Thread> io_thread_;
+  scoped_ptr<ViewerIPCServer> ipc_server_;
+
+  // An event that will be signalled when we shutdown.
+  base::WaitableEvent shutdown_event_;
+
+  // Window that we draw into.
+  scoped_ptr<ViewerHostWin> viewer_host_win_;
+
+  // Pointer to the main message loop that host this object.
+  MessageLoop* main_message_loop_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewerProcess);
+};
+
+extern ViewerProcess* g_viewer_process;
+
+#endif  // UI_VIEWER_VIEWER_PROCESS_H_