Experimentally isolate GetOpenFileName in a utility process.

chrome/utility/shell_handler_win.h

+// Copyright (c) 2014 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_UTILITY_SHELL_HANDLER_WIN_H_
+#define CHROME_UTILITY_SHELL_HANDLER_WIN_H_
+
+#include <Windows.h>
+
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "base/tuple.h"
+#include "chrome/utility/utility_message_handler.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+typedef std::vector<Tuple2<base::string16, base::string16> >
+    GetOpenFileNameFilter;
+
+// Handles requests to execute shell operations. Used to protect the browser
+// process from instability due to 3rd-party shell extensions. Must be invoked
+// in a non-sandboxed utility process.
+class ShellHandler : public UtilityMessageHandler {
+ public:
+  ShellHandler();
+  virtual ~ShellHandler();
+
+  // IPC::Listener implementation
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ private:
+  void OnGetOpenFileName(
+    HWND owner,
+    DWORD flags,
+    const GetOpenFileNameFilter& filter,
+    const base::FilePath& initial_directory,
+    const base::FilePath& filename);
+
+  DISALLOW_COPY_AND_ASSIGN(ShellHandler);
+};
+
+#endif  // CHROME_UTILITY_SHELL_HANDLER_WIN_H_